Database Users

[Q] 4g Radio not turning on

Hey everyone! I have been having a problem with my Samsung Epic. I am in NYC and recently they have turned on the 4G within the city limits. It was working great last week and I was getting a decent 4G connection (8down, 4up). Now yesterday When I went to activate the 4G radio on my phone it wasn't turning on. The 4G button stays grey and it says its turning on but it never turns green. When I go into the 4G settings its grayed out but its says "turning on..." 3g stays connected during this. Wifi works when I turn that on, but I notice back in the 4g settings menu 4g still says "Turning on".. it doesn't even time out. It completely killed my battery after 20 mins.
I tried a factory reset.. didn't work... Tried the Odin full reset (stock everything).. No dice. I never rooted the phone or did anything to it except install Juice Defender (which cause a whole bunch of problems). Has anyone else had this problem? I am within my 30days so i'm thinking of exchanging my phone.. any ideas??? Thanks in advance!!!

I'm having the same problem
Sent from my SPH-D700 using XDA App

My buddy had the same issue on his Epic. Had to trade it in for a new one.
Sent from my SPH-D700 using XDA App

I had the same problem, get to a sprint store and get your phone replaced. I'm guessing it is a radio problem. May be fixable if the sprint techs actually did something more then just resetting to stock.

Flash the DG27 radio then upgrade to DI07 again. Could also force your phone to re-provision itself.
http://firon.net/xda/modem.d700.tar here's the modem, flash it with Odin as Phone.

This is a longshot, but I've been messing around with a few settings menu and I saw an interesting WiMAX setting.
Goto the dialer, input ##3282#.
Goto WiMAX, enter your MSL code. (find your MSL code by opening an adb shell to your device, use the command "getprop" once in the shell, scroll up and look for a line that says "[ril.MSL]: [??????]")
See what it says under ACTIVATED and REALM, should say "ACTIVATED:TRUE" and "REALM:sprintpcs.com", respectively. If it doesn't that might be where your problem is. Tell a level 2 sprint tech.
Next, try to goto WORK MODE, in there you can set your work mode, mine is at 2 and 4G is working fine, I wish I could tell you what work mode 0,1, & 3 did differently, but I can't locate much info on the net. I'll update this if I find out later...
Hope this can be of some help to you.

My phone is doing the same thing. I don't live in a 4g area yet but I would like to be able to use it when I travel. If there is no 4g service, should the 4g still turn green?

Help with epic

I have never had this problem before or read about it. I keep wifi on at my house cause it's faster. Well tonight I went to plug my phone in and I took it off wifi but my 3G won't come up. I've tried everything. Pulled battery out, went to airplane mode and then back tried to update prl. I can't get my 3G to come back on. I have an app called quick settings that I've had for a long to turn off my 3G to save battery and it just says connecting.I've deleted the app and downloaded it back again and nothing. This has never happened to me before. How can I get. My Internet back? I am really lost on this one. It's like it's locked up and wont come back on. Thanks. By the way I have just about full reception.

musclehead84 said:
I have never had this problem before or read about it. I keep wifi on at my house cause it's faster. Well tonight I went to plug my phone in and I took it off wifi but my 3G won't come up. I've tried everything. Pulled battery out, went to airplane mode and then back tried to update prl. I can't get my 3G to come back on. I have an app called quick settings that I've had for a long to turn off my 3G to save battery and it just says connecting.I've deleted the app and downloaded it back again and nothing. This has never happened to me before. How can I get. My Internet back? I am really lost on this one. It's like it's locked up and wont come back on. Thanks.
Click to expand...
Click to collapse
You might have to do a factory reset. Before you do wait a bit and see if anyone has other ideas.
Sent from my SPH-D700 using XDA App

That's what I was afraid of. I'm on 2.1 and rooted but nothing has changed on my phone for at least 2 wks. No new apps or anything. Will factory resetting break my root?

Wait a while. This has happened to me on occasion and it has nothing to do with anything I did.

Check with sprint to see if there's a data outage in your area. Or you can try traveling to a different location to see if you get 3g somewhere else and then update your profile/prl from there. I had the same experience with a similar app. Went to an area where I got 3g, called sprint, and they updated my profile. Try doing that to see what happens.

I let it try it all night last night and woke up and still no 3g at the top. i can turn wifi on and it works fine. it just wont bring up the 3g icon and when i look in the quick settings it is greyed and says connecting. ill wait til i leave the house today and try it later. i just dont think its gonna work it just seems like the 3g is locked since it wont even displays the icon but hopefully im wrong thanks for the help guys. i know what you mean b3nny but my phone wont even displays the 3g icon at the top. i would assume if there was an outage it would still display the icon at the top.m,y wife has a hero and her internet is fine so no outage. thanks for trying to help but i think a factory restore is my only option. im about ready to go get to sprint and get another epic.

if i go to sprint and show them my phone i have insurance but this should go thru the manufacturers warranty. would i get a new or refurb one? i know if you use the insurance you get a refurb but what about the warranty? its not only this reason but my phone freezes a lot and will back out of an application for no reason at all. im just done with this one. there has to be one that works better than this one.thanks

Is your 3G Data enabled in the settings?
Not completely sure if it applies to 2.1 as I am running 2.2, but try and go to: 'Menu->Settings->Wireless and Networks->Mobile networks' and see if the box is checked by '3G Data'. Again, I am running 2.2, so I dont know if it is exactly the same, but worth a check.

xperia play randomly goes to no service

My xperia play randomly goes to no service then a few seconds later it goes back to full service. Has this ever happened to anyone else?

Sort of.
Right now I cannot get onto tbe android market or google maps. I can get onto google on opera and of course xda, im thinking its google. Reset doesnt help either.
If I find out whats the cause ill post back or pm.
Sent from my R800i using xda premium

That happens to me somewhat when I send MMS... but it comes out fine in the end... I don't know if that's the same issue with yours.

It used to do that a while back when I had just gotten the play, but now it never drops below 2 bars and always has 3g. I'm suspecting it has something to do with the enhanced 3g coverage upgrade they did in our area recently.
Sent from my R800x using Tapatalk

yeah. most of the time though, the zero signal comes when I wake my phone from sleep mode. other than that, full bars.

I did manage to get it working after some snooping. I went onto settings, applications, all, market and uninstalled the updates. Reverting back to the market I had when I first got the phone.
Ill mention that I messed about with download manager in the same directory in the settings, but I assume that rolling back the market did the trick.
Next day the same problem occurs, rolling back and clearing cache didnt help this time. Later In the day it fixed itself.
Im new to android so take what ive said with caution. At your own risk, but thought id mention as it could work for others. At the very least it could narrow your searching for a solution.
Hope it helps
Sent from my R800i using xda premium

Depends on the area where you are and the strength of your service.
For example theres a lot of interference at my job, to the point if I do any text messaging or facebook checking during the day my battery is near dead by the time I leave. However when I'm at home the battery will last all weekend if I don't play any games.
While I'm at work you will see it jump from 3G to nothing and back almost randomly and sometimes Facebook/market/etc work fine, other times they refuse to conenct for hours.

I get max signal at work, where I still had the problem. Signal wasnt my problem, I could get onto google through opera and on the xda app.
Sent from my R800i using xda premium

Settings/privacy settings/reset settings (NOT FACTORY RESET)
Resets all settings but leaves appa etc alone. I sync data with google so im not 100% what you might lose if you dont sync. For me the only change ive noticed is that now everything works as it should've.
The same problem keeps coming and going, im hoping that the above will work for me. Seems to be working, however if it doesnt ill post back.
Sent from my R800i using xda premium

It is a firmware problem, at least for people with R800i models. The update 3.0.A.145 (first 2.3.3 pre xLoud update) did not have any Wifi or phone drops. The xLoud update crippled the modem terribly, making it work horribly where there was no issue before...

phat_cow said:
My xperia play randomly goes to no service then a few seconds later it goes back to full service. Has this ever happened to anyone else?
Click to expand...
Click to collapse
Yep, but for me its not the phones fault, its big reds crappy service here in Houston.

Logseman said:
It is a firmware problem, at least for people with R800i models. The update 3.0.A.145 (first 2.3.3 pre xLoud update) did not have any Wifi or phone drops. The xLoud update crippled the modem terribly, making it work horribly where there was no issue before...
Click to expand...
Click to collapse
Hmmm I have a R800a with the R800i firmware. When the phone goes to no service it does drop cell signal AND wifi signal to nothing. I hope they fix this soon.

Ok problems back for me...again...
Sorry, I kind of hijacked this thread. I will start my own (after some searching) as my problem seems to be with google apps.
I can get on the internet, opera and xda come to mind immediately. But google mail, maps and the market all refuse to connect.
Thanks and goodluck
(will post back if I find a lasting solution)
Sent from my R800i using xda premium

Think its working now...shouldnt have said (typed) that.
Either way thought id mention the latest solution thats working for me. Push the power button until you get the air plane mode option come up, put it into airplane mode, then turn off air plane mode. Turn the phone off, then back on, then with any luck it should work.
I have a funny feeling that the problem was due to an ota update, I also think the solution was an ota update. New to android so im not too sure sorry. Thought id post just incase though.
If I dont post back then my phones all working, or at least not suffering from this problem.
Goodluck
Dan.
Sent from my R800i using xda premium

[Q] Moto Defy + call drop straight after dial while in 3G.

The minute I turn on my 3g any normal voice calls made from my phone gets disconnected within a second.
If I switch to Wifi / 2g the issue is solved!
I have tried Settings - Call Settings - Additional settings - Caller ID but the option of caller id itself is unselectable!! I have read many people saying to select caller ID and set network default fixing the problem but on my phone it is unselectable!
Please advice on how I can fix this problem! Thank you

Facing exactly the same probelm
Dark Prince X said:
The minute I turn on my 3g any normal voice calls made from my phone gets disconnected within a second.
If I switch to Wifi / 2g the issue is solved!
I have tried Settings - Call Settings - Additional settings - Caller ID but the option of caller id itself is unselectable!! I have read many people saying to select caller ID and set network default fixing the problem but on my phone it is unselectable!
Please advice on how I can fix this problem! Thank you
Click to expand...
Click to collapse
Even i am facing exactly the same problem. Any help to fix this would be greatly appreciated. I think this has started after updating the software.
Dark Prince - Did you too update the software from 2.1 to 2.2 before this problem started?

Any relief for this problem pls?
Sent from my MB525 using xda app-developers app

Not solved.
mrsukesh said:
Even i am facing exactly the same problem. Any help to fix this would be greatly appreciated. I think this has started after updating the software.
Dark Prince - Did you too update the software from 2.1 to 2.2 before this problem started?
Click to expand...
Click to collapse
No I am running stock 2.3.6 and havent done any updates since I got my phone 6 months back! The problem is still not resolved!
I beleive it is a problem with my carrier Airtel as they say that there is 3g upgradation going on in my area. But I still face this problem all around Bangalore!! I cant understand what is the major cause of this problem! I have used my sim in my friends Sony Ericsson Arc and there is no issue whatsoever! Im still waiting for a solution. Please lemme know if you find anything as well! Tx

I don't think its a problem with airtel because I'm facing this problem with vodafone, I m facing the same problem with airtel sim also in the same handset however same sims are working fine with other handsets.
Initially vodafone told it might be a problem in their network but after checking they confirmed that there is no issue with their network.
I feel its an issue with phone itself but know its related to hardware or software. Factory reset also didn't work, tried all possible ways that I could think of including replacing sim but no lucktill now.
I took phone to motorola service too, all they could suggest was to replace sim and factory reset which I've already done, only solution left is to give the phone for checking and they need 2 days to check if any fault is there.
Did your phone always had this problem or started recently? Do u remember making any settings in phone before this problem started?
Sent from my MB525 using xda app-developers app

This problem was recent.
mrsukesh said:
I don't think its a problem with airtel because I'm facing this problem with vodafone, I m facing the same problem with airtel sim also in the same handset however same sims are working fine with other handsets.
Initially vodafone told it might be a problem in their network but after checking they confirmed that there is no issue with their network.
I feel its an issue with phone itself but know its related to hardware or software. Factory reset also didn't work, tried all possible ways that I could think of including replacing sim but no lucktill now.
I took phone to motorola service too, all they could suggest was to replace sim and factory reset which I've already done, only solution left is to give the phone for checking and they need 2 days to check if any fault is there.
Did your phone always had this problem or started recently? Do u remember making any settings in phone before this problem started?
Sent from my MB525 using xda app-developers app
Click to expand...
Click to collapse
You're right.. I guessed the same! Well this phone has been giving me this problem since January of this yr. Before that it was perfect! I cant remember making any changes in the settings. I have also done a factory reset but the issue isnt solved. I cant understand what to do now?! this really is getting irritating cause every time i have to make a call i switch off the Data using toggles widget and turn on again once done. I cant do this forever. Even the calls which I get from someone else gets cut in a second and appears as a missed call. I desperately need someone to suggest a cure for this!
Do let me know if you have made any setting changes recently . I ll try to remember if there is any common changes we have made and try to find a solution for this.

Additional info
Dark Prince X said:
You're right.. I guessed the same! Well this phone has been giving me this problem since January of this yr. Before that it was perfect! I cant remember making any changes in the settings. I have also done a factory reset but the issue isnt solved. I cant understand what to do now?! this really is getting irritating cause every time i have to make a call i switch off the Data using toggles widget and turn on again once done. I cant do this forever. Even the calls which I get from someone else gets cut in a second and appears as a missed call. I desperately need someone to suggest a cure for this!
Do let me know if you have made any setting changes recently . I ll try to remember if there is any common changes we have made and try to find a solution for this.
Click to expand...
Click to collapse
I also want to state that when my 3g was on before the issue began it used to be displayed as H - meaning high speed internet. Since the day I ve been facing this problem the H symbol changes to 3G - once this transition takes place immediately call gets dropped. I ve never seen the 3G being displayed before the problem.
Question: Does the 3G have to be switched off automatically once a call is made? Like for eg. if you re connected on wifi, even when you are in a call the wifi is still on and active in the background.
Is the 3G supposed to switch off automatically once a call is made just like it does when in 2g??

Some of the things I remember which happened before this problem started are:
1) I updated the firmware.
2) I kept a heavy bag on my phone by mistake.
3) I changed the phone's battery, I'm now using the an extended battery bought from eBay.
4) I changed the screen guard, using a matte finish guard now. (wondering if the solvents that they use while fixing the screen guard have any impact on this)
5) I started using the application Team Viewer a lot to operate my home laptop from office.
I've mentioned everything that I could think of, is any of this matching with you?
Its was a very good handset till this problem started, I don't want to buy a new phone just to fix this problem.
One more thing I observed is that this problem has increased over time, initially when this came to my notice 50% of the calls got cut while using 3g, but now all calls are dropped while using 3g.
The calls - both incoming and outgoing are working fine even if 3g is on but no data is being transfered. Once the call is connected 3g works fine. The problem is only in starting/initiating the call while 3g data transfer is happening once the call is connected 3g is fine.
Regarding my usage:
I've been using this phone very roughly from past one n half year, I use it regularly to download using both wi fi n 3g, I listen to music everyday using bluetooth n also watch many movies on my phone itself.
In short usage is very high n rough.
Could it be a wear n tear damage because of this?
Pls let me know if any of the mentioned points match with you which will help us locate the reason for the problem.
Sent from my MB525 using xda app-developers app

No matches!
Dark Prince X said:
You're right.. I guessed the same! Well this phone has been giving me this problem since January of this yr. Before that it was perfect! I cant remember making any changes in the settings. I have also done a factory reset but the issue isnt solved. I cant understand what to do now?! this really is getting irritating cause every time i have to make a call i switch off the Data using toggles widget and turn on again once done. I cant do this forever. Even the calls which I get from someone else gets cut in a second and appears as a missed call. I desperately need someone to suggest a cure for this!
Do let me know if you have made any setting changes recently . I ll try to remember if there is any common changes we have made and try to find a solution for this.
Click to expand...
Click to collapse
mrsukesh said:
Some of the things I remember which happened before this problem started are:
1) I updated the firmware.
2) I kept a heavy bag on my phone by mistake.
3) I changed the phone's battery, I'm now using the an extended battery bought from eBay.
4) I changed the screen guard, using a matte finish guard now. (wondering if the solvents that they use while fixing the screen guard have any impact on this)
5) I started using the application Team Viewer a lot to operate my home laptop from office.
I've mentioned everything that I could think of, is any of this matching with you?
Its was a very good handset till this problem started, I don't want to buy a new phone just to fix this problem.
One more thing I observed is that this problem has increased over time, initially when this came to my notice 50% of the calls got cut while using 3g, but now all calls are dropped while using 3g.
The calls - both incoming and outgoing are working fine even if 3g is on but no data is being transfered. Once the call is connected 3g works fine. The problem is only in starting/initiating the call while 3g data transfer is happening once the call is connected 3g is fine.
Regarding my usage:
I've been using this phone very roughly from past one n half year, I use it regularly to download using both wi fi n 3g, I listen to music everyday using bluetooth n also watch many movies on my phone itself.
In short usage is very high n rough.
Could it be a wear n tear damage because of this?
Pls let me know if any of the mentioned points match with you which will help us locate the reason for the problem.
Sent from my MB525 using xda app-developers app
Click to expand...
Click to collapse
Well Sry but nothing in common! For me since the beginning of the problem, 100% of the calls are getting dropped! its been a month now. Do you face this problem in a specific area or all over town? Ive searched a lotta forums for an answer but to no avail! I dont know if rooting the phone will help!?!?! but that is my next step. Did you try going to Settings<Wifi and Networks<Mobile networks and selecting 3G only? FOr me the problem persists but i guess you should try this.

Hmm, problem is all over the town.
I've also selected 3g only in settings.
Even I'm thinking of rooting my phone but I'm afraid I'll brick my phone.
How are you planning to root your phone?
Sent from my MB525 using xda app-developers app

I guess we have 2 probs in common!
mrsukesh said:
Hmm, problem is all over the town.
I've also selected 3g only in settings.
Even I'm thinking of rooting my phone but I'm afraid I'll brick my phone.
How are you planning to root your phone?
Sent from my MB525 using xda app-developers app
Click to expand...
Click to collapse
I ve posted on a forum for rooting advice as well! Still confused on which procedure to follow. The cm10 JB from Quarx sounds promising but only for defy MB525! Lucky you. I still have to wait for the MB526 which is not yet stable!

Thanks, can you pls provide the link to the page where step by step rooting instructions have been provided..
Do let me know if you come across any solution or workaround for this problem, I'll also update you if I get any..
Sent from my MB525 using xda app-developers app

Root
mrsukesh said:
Thanks, can you pls provide the link to the page where step by step rooting instructions have been provided..
Do let me know if you come across any solution or workaround for this problem, I'll also update you if I get any..
Sent from my MB525 using xda app-developers app
Click to expand...
Click to collapse
http://forum.xda-developers.com/showthread.php?t=1768702
This link seems to be the best method based on comments but I dont know how to.

Phone given for Service!
Dark Prince X said:
http://forum.xda-developers.com/showthread.php?t=1768702
This link seems to be the best method based on comments but I dont know how to.
Click to expand...
Click to collapse
Ive given my phone for service today. Hope I ll get my phone fixed!

Great, let me know if its fixed. I'll also get it done.
Rooting seems to be complicated, didn't do it as I'm afraid of briking my phone.
Sent from my MB525 using xda app-developers app

Still in service
mrsukesh said:
Great, let me know if its fixed. I'll also get it done.
Rooting seems to be complicated, didn't do it as I'm afraid of briking my phone.
Sent from my MB525 using xda app-developers app
Click to expand...
Click to collapse
I gave my phone for service yest and I am expecting it tomorrow in the evening. Will Keep you posted on the update.

Same problem
I am EXACTLY facing the same problem. I have an AirTel sim and I don't remember from this problem got started. I tried restoring factory setting, flashing the phone in authorized service center and nothing helped. I was about to install custom ROM and just read this thread in the forum. I will wait for some more time to see if any of you is lucky enough to find a solution for it.
As a temporary workaround, I have changed the GPRS to 2G and its working now. In 3G, if I try making calls, the data connectivity will not be cancelled, but in 2G, as soon as you hit the green button, the data will be cancelled.
Please reply if you find any solution for it. Thank you!

Solved!
Noob-New said:
I am EXACTLY facing the same problem. I have an AirTel sim and I don't remember from this problem got started. I tried restoring factory setting, flashing the phone in authorized service center and nothing helped. I was about to install custom ROM and just read this thread in the forum. I will wait for some more time to see if any of you is lucky enough to find a solution for it.
As a temporary workaround, I have changed the GPRS to 2G and its working now. In 3G, if I try making calls, the data connectivity will not be cancelled, but in 2G, as soon as you hit the green button, the data will be cancelled.
Please reply if you find any solution for it. Thank you!
Click to expand...
Click to collapse
Please call me at 09900567837 . I ve found the issue to the problem!

Please find if anything in common
Dark Prince X said:
Please call me at 09900567837 . I ve found the issue to the problem!
Click to expand...
Click to collapse
1) Does anyone of you NOT use motoblur Account????
2) Does anyone of you NOT use google account in your phone?
I think the solution lies in the questions above. If you use either one, the problem will persist. Try to factory reset your phone and skip log in Motoblur and Skip google account sync. The problem should be solved.

No luck
As suggested by you, I did a factory reset and tried making call without adding Google account and it didn't workout. I had the same problem. I even tried adding another Google account (after wiping data) and same problem. I lost hope
I am gonna use my mobile with 2G only till someone finds a permanent solution.
Thanks for your help!

Razr M stuck on 3g!

So a few days ago, my Razr M decided to stop using 4g, and is now stuck using 4g. Even after returning to stock 4.4.2, this is still an issue. Any insight as to what's wrong with my phone?

Had this happen once I tried a bunch of stuff... I can't remember but I think I actually just let it die to 0% and let it charge back to 100% while off... But during that time I also pulled my SD card out put the data on my PC formatted it put data back on... I don't think the new Sim helped at all but it wouldn't hurt to try
Sent from my XT907 using xda app-developers app

Did you try the battery drain. Also turn the phone off, take the 4g simcard out and ensure no dust is in the slot (maybe blow it with a bit of compressed air).
Sent from my RAZR M xt907 (KitStalk) using Tapatalk

I'll give battery drain a go. I haven't done that, and I might need a new Sim.
Sent from my DROID RAZR M using XDA Free mobile app

Same issue -- this was how I fixed mine
jrk190 said:
So a few days ago, my Razr M decided to stop using 4g, and is now stuck using 4g. Even after returning to stock 4.4.2, this is still an issue. Any insight as to what's wrong with my phone?
Click to expand...
Click to collapse
I've had this happen after flashing some ROMs (MIUI and older CM versions). It's a ***** to fix, and honestly its mostly trial and error. I did manage to get it to work, but I can't remember the exact series of things I did. You can tell its working correctly when it shows 4G/LTE (not just LTE) and you can still make phone calls, and you can send/receive texts and MMS.
Before trying any of this though, it might just be a KitKat issue -- you will lose a huge amount of reception running the stock 4.4.2 OS. When I tried it I was never able to get 4G due to the poor signals I was getting with KitKat. I would strongly recommend reflashing to the the last Jelly Bean stock firmware (skip gpt.bin and tz.bin) and see if you still have the no 4G issue. I'm running stock JB (with the garbage apps frozen) after trying every ROM out there, because the signals I get are way stronger, and the battery life (might be due to better signals?) is amazing -- I can go 2-3 days without a charge.
In any case, if you still want to try it, I think these settings are the ones you want (what worked for me was actually TOGGLING the settings to something else, then back to the correct ones). Also, this was under JB, but I think its identical with KitKat:
Dial *#*#4636#*#*
Go to Phone Info. Click the menu option and click on the Radio Bands. Change it to US Band. This will break everything.
Go back to the menu and Radio Bands. Change it back to Cellular.
Then scroll down and click on the Preferred Network Type. Change it to GSM/CDMA (Auto). At this point you should see the Location: showing actual info in the BID, SID, NID fields, and GSM will be "In Service", GSRM will be "Connected" and Network Type will probably be eHRPD (which is still 3G).
Click on the preferred network type again and change it to "LTE/CDMA/Evdo". It should change the GSRM to LTE. If not, power off, pull the SIM, power on. Wait for it to say SIM not found. Power back off, put in the SIM and power back on.
Go to your Settings, and under Wireless & networks click on More... and click Mobile Networks. Again, the fix was toggling, so if it says Global, change it to LTE/CDMA or if it says LTE/CDMA, change it to Global. It doesn't matter which one its set to (as long as its one of those 2 and you toggled it).
At this point, I had to let the phone sit for about 10-15 minutes. After I came back, it started switching automatically to 4G/LTE and you should be good to go.
If you can't MMS or text, go back to the Mobile Networks settings, click on Access Point Names, click the menu and reset to default. Power off and power back on.
Hope this helps... GL!

I wish I could say that helped... But it didn't... I'm not sure what this thing is doing, in LTE, it doesn't even detect a network.
Sent from my DROID RAZR M using XDA Free mobile app

I had the same problem. Lost 4g.
Tried all of the suggestions in this thread and the CM11 and GPE threads in Android Dev section.
Got a new sim card.
All better.

Izaak99 said:
I've had this happen after flashing some ROMs (MIUI and older CM versions). It's a ***** to fix, and honestly its mostly trial and error. I did manage to get it to work, but I can't remember the exact series of things I did. You can tell its working correctly when it shows 4G/LTE (not just LTE) and you can still make phone calls, and you can send/receive texts and MMS.
Before trying any of this though, it might just be a KitKat issue -- you will lose a huge amount of reception running the stock 4.4.2 OS. When I tried it I was never able to get 4G due to the poor signals I was getting with KitKat. I would strongly recommend reflashing to the the last Jelly Bean stock firmware (skip gpt.bin and tz.bin) and see if you still have the no 4G issue. I'm running stock JB (with the garbage apps frozen) after trying every ROM out there, because the signals I get are way stronger, and the battery life (might be due to better signals?) is amazing -- I can go 2-3 days without a charge.
In any case, if you still want to try it, I think these settings are the ones you want (what worked for me was actually TOGGLING the settings to something else, then back to the correct ones). Also, this was under JB, but I think its identical with KitKat:
Dial *#*#4636#*#*
Go to Phone Info. Click the menu option and click on the Radio Bands. Change it to US Band. This will break everything.
Go back to the menu and Radio Bands. Change it back to Cellular.
Then scroll down and click on the Preferred Network Type. Change it to GSM/CDMA (Auto). At this point you should see the Location: showing actual info in the BID, SID, NID fields, and GSM will be "In Service", GSRM will be "Connected" and Network Type will probably be eHRPD (which is still 3G).
Click on the preferred network type again and change it to "LTE/CDMA/Evdo". It should change the GSRM to LTE. If not, power off, pull the SIM, power on. Wait for it to say SIM not found. Power back off, put in the SIM and power back on.
Go to your Settings, and under Wireless & networks click on More... and click Mobile Networks. Again, the fix was toggling, so if it says Global, change it to LTE/CDMA or if it says LTE/CDMA, change it to Global. It doesn't matter which one its set to (as long as its one of those 2 and you toggled it).
At this point, I had to let the phone sit for about 10-15 minutes. After I came back, it started switching automatically to 4G/LTE and you should be good to go.
If you can't MMS or text, go back to the Mobile Networks settings, click on Access Point Names, click the menu and reset to default. Power off and power back on.
Hope this helps... GL!
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Click to collapse
So this worked for me....kinda. It will keep my LTE when I switch back and forth, but only until I call someone. At which point it will stop auto-switching back and forth.

So, I got a new SIM, and things worked for a while, but when I tried to make a call, it said "Phone not authenticated". So I go back in, the guy says to dial *228, and 1 to activate. I do it, and the calling works, but I'm back to 3g. So I'm back in this boat again...while I get 4g in my Gnex, with the same Sim...

jrk190 said:
So, I got a new SIM, and things worked for a while, but when I tried to make a call, it said "Phone not authenticated". So I go back in, the guy says to dial *228, and 1 to activate. I do it, and the calling works, but I'm back to 3g. So I'm back in this boat again...while I get 4g in my Gnex, with the same Sim...
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Click to collapse
Didn't ATTACK tell you in another thread that *228 fries the 4g sim cards?
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True... But see, the same SIM can get 4G in my Galaxy Nexus, which makes 0 sense. I might go get another SIM again, but I'll just deal with it for a while. It works if I do LTE only mode on my Razr. It's strange that the same SIM works perfect in my other phone.

I would factory reset or wait a few days. In a few days a new software update will be rolling out.

Probably won't use it. It'll lock my boot loader or unroot me, which I'd hate.
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jrk190 said:
Probably won't use it. It'll lock my boot loader or unroot me, which I'd hate.
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Click to collapse
It will make you lose root but you can't lock your boot loader after its unlocked... Even taking an OTA. So just flash twrp and flash SuperSU zip and then you're good to go after a OTA
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Sorry. Haven't had to worry about OTA's in ages... None of my phones ever got updates, 'cept this one.
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jrk190 said:
Probably won't use it. It'll lock my boot loader or unroot me, which I'd hate.
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Click to expand...
Click to collapse
You're boot loader will not be relocked. . if the ota wasn't relocking the bl and doing just the opposite then you have nothing to worry about regarding that... As for unroot you're unlocked so all you'd have to do is flash SuperSU or use the root method again... If you're stock then rather the FDR just run it in safe mode long press power button till screen pop long press power off till screen pop select OK...if safe mode helps then you'll need to FDR...
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