LTE band availability and usage - ZTE Axon 7 Questions & Answers

I've noticed that using the dialer code: *#*#4636#*#* we can access a debugging menu.
Tap 'Phone Information' and you'll see a slew of information about the current connection status.
As you can also see, there's a drop down box labeled 'Set Preferred Network Type:' which allows you to change the cellular network type(just like in the Mobile network settings Menu). This is great if you are in a location and have a data connection but aren't getting any throughput. But there's also a drop down under box under the same 'Phone Information' debugging menu, on the top right(three button) that gives you an option of selecting the radio band as well.
My question is, will there be a way to implement into custom Roms or kernels to allow the radio bands and network types to switch to the best frequency with most data throughput?
Walking through my house, I have dead zones. In those dead zones I have to switch to 800mhz and change my type to LTE/WCDMA. Could we have an auto search for radio frequencies and the individual bands on those frequencies or will I always have to manually change them?

Correct me if I'm wrong, but I think the "Select Radio Band" is set to "Automatic" by default, and changing it to something else (like "Cellular 800"), prevents you from going back into automatic mode unless you reset your modem (easiest via TWRP).

xtermmin said:
Correct me if I'm wrong, but I think the "Select Radio Band" is set to "Automatic" by default, and changing it to something else (like "Cellular 800"), prevents you from going back into automatic mode unless you reset your modem (easiest via TWRP).
Click to expand...
Click to collapse
Usually the modem resets to auto when I hard reboot. Either way, the automatic setting isn't doing its job.

Related

Stuck SMS problem - Try this out...

Didn't have time to browse all the posts on this issue but while we're waiting for the next useless hotfix from HTC, I tried to go with manual settings for the network and network type by doing the following:
1. Wireless controls>Phone>Band: Change network type from Auto to WCDMA. Left Band Frequency on auto. Done.
2. Settings>All Settings>Personal>Phone>Network: Changed "Network selection" to "Manual". Your device will search for all available networks. Pick your carrier/network from the list.
3. On the same screen as 2, tap on "Set Networks" and uncheck all other networks except your own primary network.
With the above change the phone will only have my home carrier to choose from (not sure if that makes any difference) and the network type will always stay with HSPA which is no problem for me in the area I live, in fact I want that.
Cant confirm if this does it since the issue occurs sporadic, but so far five days without any SMS stuck in the outbox which is unusual for me, used to get it every single day.
Obviously the above leaves it to you to manually manage the network settings as well as running H all the time may be a problem for some, but if this works as an interim (hopefully not permanent!) solution for some users it could be worth giving it a shot...
Cheers.
Rom:1.48.405.2 UK, clean install without any of the previous SMS fixes but including all the currently avail updates from HTC.
Radio:15.28.50.07
Alisha said:
Didn't have time to browse all the posts on this issue but while we're waiting for the next useless hotfix from HTC, I tried to go with manual settings for the network and network type by doing the following:
1. Wireless controls>Phone>Band: Change network type from Auto to WCDMA. Left Band Frequency on auto. Done.
2. Settings>All Settings>Personal>Phone>Network: Changed "Network selection" to "Manual". Your device will search for all available networks. Pick your carrier/network from the list.
3. On the same screen as 2, tap on "Set Networks" and uncheck all other networks except your own primary network.
With the above change the phone will only have my home carrier to choose from (not sure if that makes any difference) and the network type will always stay with HSPA which is no problem for me in the area I live, in fact I want that.
Cant confirm if this does it since the issue occurs sporadic, but so far five days without any SMS stuck in the outbox which is unusual for me, used to get it every single day.
Obviously the above leaves it to you to manually manage the network settings as well as running H all the time may be a problem for some, but if this works as an interim (hopefully not permanent!) solution for some users it could be worth giving it a shot...
Cheers.
Rom:1.48.405.2 UK, clean install without any of the previous SMS fixes but including all the currently avail updates from HTC.
Radio:15.28.50.07
Click to expand...
Click to collapse
On mine under Wireless Settings>Phone is only has the options for sounds available?
Jammie: Doesn't sound like the right place. It's basically just the Comm Manager.
Thats right: Comm Manager/Phone then scroll down to Band to make those changes, then Done or Cancel and hit the Menu/Network or Advanced Network tab.
Bear in mind that if you select WCDMA only as opposed to Auto, then you will have no signal at all if you go to a non-3G area (of which there are still many thousands of square miles in UK!); overall its best to keep this at Auto for everyday use.
OK, I did steps 2 & 3 but on the first I had problem... Phone couldn't connect with the network with WCDMA, only with gsm, so I turned it from auto to gsm... I don't care about 3G
have tried all that and it didn't solve the sms problem for me...

3G only???

Does anyone know how to enable 3G only on Vibrant????
I can see the option for 2G only, not for 3G... BTW my phone is rooted...
why would you want 3G only? when "2G only" is disabled... 3G is on but if there isn't 3G signal then it goes to alternative EDGE (2G) temporarily until 3G signal is available
"3G Only" isn't a feature.. and its pointless to have it as well
zephiK said:
why would you want 3G only? when "2G only" is disabled... 3G is on but if there isn't 3G signal then it goes to alternative EDGE (2G) temporarily until 3G signal is available
"3G Only" isn't a feature.. and its pointless to have it as well
Click to expand...
Click to collapse
it will be pointless for T-Mobiles users. But it will makes sense for Wind Mobiles users (Canada) cause Wind only has 3G connection and doesn't have any 2G connection.
Ya, so now you know it's not pointless. So what's the solution?
jaykim85 said:
it will be pointless for T-Mobiles users. But it will makes sense for Wind Mobiles users (Canada) cause Wind only has 3G connection and doesn't have any 2G connection.
Ya, so now you know it's not pointless. So what's the solution?
Click to expand...
Click to collapse
I'm pretty sure by default with the 2G unchecked that it's on 3G mode.
It's not a feature, it's just what it is...it's always on 3G accessibility.
http://ip208-100-42-21.static.xda-developers.com/showthread.php?t=734515
Use the code for Battery and General Info: *#*#4636#*#*
Towards the bottom there is an option for "Set preferred network type"
You can change that to only use the networks you want.
The descriptions of each of the choices are at the bottom of the linked post.
Hope that helps
I found that menu didn't work for me. I used that menu on my G1 and it worked great, but it seems to have no effect on the Vibrant.
Check out this post: (change the xx to tt, I can't post links yet)
hxxp://forum.xda-developers.com/showpost.php?p=7208948&postcount=2
That's the proper way to force 3g mode, and I do it on my phone it works great.
Also, another reason to force 3g only is if you live in a weak 3g area. I don't want to ride the edge network 60% of the time if I can force 3g and get it 100% of the time.
Hey none of the methods I read here work.
So after playing around with my phone a little bit, I discovered a way to actually lock 3g.
Again I'm not a phone expert, and I discovered this on my own, so use with caution, I don't want to be blaimed for a broken phone.
here is how I did, copy and pasted from another forum I posted these instructions in:
Tired of edge speeds, want to lock in 3g? Okay this next one, do at your own risk ask usual, use with caution. I kinda figured this one out on my own, through trial and error, so I’m not sure how stable or accurate, or even how safe it is to do this. I did notice though, if you screw up, you can use the factory reset code above and things should go back to factory defaults.
Okay…so again do at your own risk. Also by locking into 3g speeds, if you ever go into a non 3g area, or if your 3g signal is poor in your area, then your phone calls will drop and data will stop, unless you go back and set the phone to its default automatic gsm/cdma settings.
Dial: *#*#197328640#*#*
Click [1] debug screen
Click [8] phone control
Click [7] network control
Click [2] band selection
This is where you make a change, default setting is [1] automatic, which means it chooses automatically between gsm/cdma (Edge vs 3g). So we are going to change this and set it to wcdma band which is 3g.
Click [2] wcdma band
Click [1] wcdma all []
Now it should display “select wcdma all bands [*]"
Now on the bottom of your phone, click the menu key, it’s the one next to the home key, now click back, menu again one more time, back one more time, this is just to confirm it set to number 2 wcdma band.
Now click menu key one last time, click end.. and you are done. Now to double verify that the phone is locked into 3g, dial in: *#*#4636#*#*
Then click phone information Then scroll down to “set preferred network type” It should now have listed “wcdma only.” PS, if you tried to do a shortcut, and just set wcdma this way first without doing the lock above, it would just go back to gsm/cdma auto once you exit the screen.
Your phone should now be locked into 3g.
Just to confirm, i upgraded my firmware to XWJM5 today, and i noticed that in settings > wireless and network > mobile networks, there's a new menu 'network mode' in which there's 3 options - auto / gsm only / wcdma only. Nice touch!
In answer to the cynics, there are times when browsing, when the phone is borderline whether to give you 2g or 3g, it does come in handy, and it's safer too, as if i have to browse on 2g it makes me want to smash the phone up!!
SamsungGalaxySVibrant said:
Hey none of the methods I read here work.
So after playing around with my phone a little bit, I discovered a way to actually lock 3g.
Again I'm not a phone expert, and I discovered this on my own, so use with caution, I don't want to be blaimed for a broken phone.
here is how I did, copy and pasted from another forum I posted these instructions in:
Tired of edge speeds, want to lock in 3g? Okay this next one, do at your own risk ask usual, use with caution. I kinda figured this one out on my own, through trial and error, so I’m not sure how stable or accurate, or even how safe it is to do this. I did notice though, if you screw up, you can use the factory reset code above and things should go back to factory defaults.
Okay…so again do at your own risk. Also by locking into 3g speeds, if you ever go into a non 3g area, or if your 3g signal is poor in your area, then your phone calls will drop and data will stop, unless you go back and set the phone to its default automatic gsm/cdma settings.
Dial: *#*#197328640#*#*
Click [1] debug screen
Click [8] phone control
Click [7] network control
Click [2] band selection
This is where you make a change, default setting is [1] automatic, which means it chooses automatically between gsm/cdma (Edge vs 3g). So we are going to change this and set it to wcdma band which is 3g.
Click [2] wcdma band
Click [1] wcdma all []
Now it should display “select wcdma all bands [*]"
Now on the bottom of your phone, click the menu key, it’s the one next to the home key, now click back, menu again one more time, back one more time, this is just to confirm it set to number 2 wcdma band.
Now click menu key one last time, click end.. and you are done. Now to double verify that the phone is locked into 3g, dial in: *#*#4636#*#*
Then click phone information Then scroll down to “set preferred network type” It should now have listed “wcdma only.” PS, if you tried to do a shortcut, and just set wcdma this way first without doing the lock above, it would just go back to gsm/cdma auto once you exit the screen.
Your phone should now be locked into 3g.
Click to expand...
Click to collapse
Do you have to do this each time you reboot the phone or are the settings get saved somehow?
Just to confirm, i upgraded my firmware to XWJM5 today, and i noticed that in settings > wireless and network > mobile networks, there's a new menu 'network mode' in which there's 3 options - auto / gsm only / wcdma only. Nice touch!
Click to expand...
Click to collapse
Setting to WCDMA only does not change a thing.
Orochi77 said:
Setting to WCDMA only does not change a thing.
Click to expand...
Click to collapse
Well i don't know what's up with your phone, but on my phone, it sets it to pick up wcdma only, like it says.
spark001uk said:
Well i don't know what's up with your phone, but on my phone, it sets it to pick up wcdma only, like it says.
Click to expand...
Click to collapse
Probably has to do with my provider.
Thanks for your answer.

wcdma preferred. ..??

Had a Droid for awhile and could allways change between cdma and Evdo but with my fascinate it is set to wcdma preferred and will not change...??
check this thread. http://forum.xda-developers.com/showthread.php?t=794551
ya i know how to get to the settings but i can choose cdma/auto prl but it wont stick.
Is there an answer for this?
Stock Fascinate, looking to resolve a high Time Without Signal (50%). I'd like to try changing from WCDMA Preferred to CDMA Auto (PRL). I'm aware of the setting under the debug/test menu (*#4636*1111#, then under Phone information > Set preferred network type), but the setting doesn't stick.
If i leave the settings page w/ the Home button, checking the setting shows that it has changed to "Unknown" and seems to stay that way if I exit in that manner.
If I exit the page using the back button, the setting reverts to WCDMA Preferred.
Is there a way to make the setting stick?
keeena said:
Is there an answer for this?
Stock Fascinate, looking to resolve a high Time Without Signal (50%). I'd like to try changing from WCDMA Preferred to CDMA Auto (PRL). I'm aware of the setting under the debug/test menu (*#4636*1111#, then under Phone information > Set preferred network type), but the setting doesn't stick.
If i leave the settings page w/ the Home button, checking the setting shows that it has changed to "Unknown" and seems to stay that way if I exit in that manner.
If I exit the page using the back button, the setting reverts to WCDMA Preferred.
Is there a way to make the setting stick?
Click to expand...
Click to collapse
If you have any luck figuring this out let me know! I am having similar issues with a high Time Without Signal.
I was just looking at this today and have the same question. Also will this help me force roam to sprint, my coworkers get 5 bars on a Epic and about 100kb down. im geting like 1 bar and about 10kb, i have tried roam control with not a lot of luck.

[GUIDE][No Root][5.0][4.X] Enabling LTE Without Root

EDIT: Clearly now that there are custom ROMs, this will be less likely an issue. But @icheyne pointed out a good method that will work on most ROMs I believe, since it uses Android's default testing menu.
For those seeking a permanent solution, you WILL need root.
Currently no permanent solution on LG Stock Lollipop.
Here is some information about my situation:
-Currently on Fido Network in Canada (LTE Band 7 [2600 MHz])
-I have achieved LTE speeds of 31mbps (Down) and 25mbps (Up).
-I am rooted, but it should work without root access.
-Firmware is stock V10h-TWN-XX
-Network mode only shows GSM / WCDMA
Before you begin, this is what you need:
-An LTE micro sim.
-Do some research on which LTE bands your network uses and if your variant has the ability to use that band.
-Correct LTE APN settings for your mobile carrier. Make sure it is LTE APN, my carrier has two separate ones (Regular, LTE).
-Mobile Network does NOT have to be turned off (You can keep data on during all of this).
-With Mobile Network on, go into Settings -> About Phone -> Network and remember what is written under "Mobile network type".
-Make sure you are in a location that has decent LTE connection.
METHOD FOR LG STOCK LOLLIPOP
1) Open up your Dialer, and type in the following to enter LG's Hidden Menu: "3845*#855#" for D855 (If your model is not listed, please do Google it!)
"3845*#850#" for D850
"3845*#851#" for D851
"3845*#852#" for D852
2) Go down and select "LTE-Only" and go into "Modem Settings"
3) Now select "RAT Selection" and click on "GSM/WCDMA/LTE auto"
4) Without rebooting, the data icon switched from "H" / "3G" to "4G" for the first time (Turn on Mobile Network if you haven't already)
5) Now go into Settings -> About Phone -> Network and under "Mobile network type" it should have "LTE" instead of what you had before
Currently no permanent solution, each time you reboot, switch to 2G/3G, or go into "Mobile Networks" menu, you will lose LTE
But it's okay, redoing steps 1 to 3 will get LTE back once again. Tedious, but at least it works
--------------------------------------------------------------------------​
QUICK METHOD (Working for all Jelly Bean ROMs & some Lollipop ROMs) (Thanks to @icheyne)
1) Go into Dialer -> Dial *#*#4636#*#* -> Phone Information
2) Scroll down to "Set preferred network type:" and click on the pull-down menu
3) Select what type of setting you want, I personally keep it on "LTE/GSM/WCDMA"
4) Select "LTE-Only" and go into "Modem Settings"
5) Without rebooting, the data icon switched from "H" / "3G" to "4G" for the first time (Turn on Mobile Network if you haven't already)
6) Now go into Settings -> About Phone -> Network and under "Mobile network type" it should have "LTE" instead of what you had before
7) [ROOT][Permanent LTE] For myself, I used a root explorer (ES File Explorer) and go into "/system/app" and delete (or move) LteConfigs.apk and LteConfigs.odex. Now you should be able to go into the "Mobile network" menu and it should have the "GSM/WCDMA/LTE auto" setting. Thus making LTE a permanent option.
Those without root access will lose LTE if they restart, switch to 2G/3G, or try to go into the "Mobile network" menu.
If you have any questions, please leave a reply. Hope this helped.
If anyone who cannot get this to work, please post with your details (firmware, carrier, LTE band, etc...).
i have heard some reports that updating some settings in the hidden menu will work, but after restart, it will just go back...hmmm.. this one retains the LTE option?
Yes, after having it on for a few days, restarts, as well as going to an area of weak reception will not affect it. It will sometimes jump back to 3g in weak signal spots (underground), but after I go outside, it will switch to LTE automatically. I should probably update the title since I've learned that this applies to other models as well.
EDIT: @chacho_2me So I found out what breaks the LTE, but it's not major unless you manually switch from LTE to 2g or something like that. Step 11 should say it all, just don't go into the mobile network menu, and you should be fine.
thanks dude..currently im roaming....will try this one when im at home
thank you so much sir.. hope i could help you sometime
I really dont know why LG didnt notice not having the LTE option on othe releases
anyhow...thanks again dude
@chacho_2me Very sorry, I don't know what happened, but unfortunately restarts reverts it back to 2G/3G. But I'll look around to see what I can do to get it to retain, will most likely need root.
If it already states LTE under Settings > About Phone > Network, would you still recommend going ahead with this tweak?
@Curleyyy Are you getting LTE reception though? If you are, then you don't need to do this. This isn't really that much of a tweak, more like just some hidden settings, that's all.
If I'm not mistaken > 2G > 3G >4G > 4G LTE ?? Reception around my place is usually 3G with a bit of 4G occasionally.
@Curleyyy In terms of speed, LTE is currently the fastest. But reception wise, it might not be the best choice. If you are in an area with poor 4G/LTE reception, it is best to go with 3G connection. If you like to find out exactly which regions have 4G/LTE, I'm sure your carrier will have that information on their website.
Thank you so much
It's working fine on Fido. A heartfelt Thank you
Cheers
I found a solution that doesn't require knowledge of the network's LTE bands:
Dial *#*#4636#*#*
Click Phone Information
Scroll down the page to the GSM/WCDMA dropdown.
Select LTE/GSM/WCDMA - the data icon should switch from H or 3G to 4G.
[ROOT ONLY] Using a root file manager (ES File Explorer) go into "/system/app" and rename LteConfigs.apk and LteConfigs.odex to LteConfigs.apk.bak and LteConfigs.odex.bak
Reboot
Go to Settings -> Tethering & networks -> Mobile Networks → Network Mode and select GSM/WCDMA/LTE auto.
@icheyne I confirm that works, I will change the post.
cannot open on android L
cant opened in android L too
chacho_2me said:
cannot open on android L
Click to expand...
Click to collapse
I need to change lte band. What way i have. Secret menu ont allowed me to do it in Android 5
Oh dear, that's inconvenient. I don't have lollipop installed yet, since it's been quite busy for me and I need my phone. I will try to update the guide for Lollipop.
When I can test it personally, but for now, if you could try to surf the forums. I am short on time lately, I do apologize.
O29C said:
Oh dear, that's inconvenient. I don't have lollipop installed yet, since it's been quite busy for me and I need my phone. I will try to update the guide for Lollipop.
When I can test it personally, but for now, if you could try to surf the forums. I am short on time lately, I do apologize.
Click to expand...
Click to collapse
On mine, only the .apk file was present, not the .odex file. I have flashed a stock-based lollipop rom. I renamed the .apk file and the lte was added to the mobile networks menu, but my phone is still not connecting to lte .
It is correct, the "phone information" menu loads on lollipop, but an error message pops up overtop and you can't get to the settings due to this.
I sure hope I can get this working or I'm going to have to get a different device!
@vinistois Thank you for reminding me about this. I do apologize in advance for not keeping up with this as I am still sticking with JB for the time being. I just flashed L to try to clear things up. Are you currently rooted? And do you have the D855 model?
help needed
O29C said:
EDIT: Clearly now that there are custom ROMs, this will be less likely an issue. But @icheyne pointed out a good method that will work on most ROMs I believe, since it uses Android's default testing menu.
For those seeking a permanent solution, you WILL need root.
Currently no permanent solution on LG Stock Lollipop.
Here is some information about my situation:
-Currently on Fido Network in Canada (LTE Band 7 [2600 MHz])
-I have achieved LTE speeds of 31mbps (Down) and 25mbps (Up).
-I am rooted, but it should work without root access.
-Firmware is stock V10h-TWN-XX
-Network mode only shows GSM / WCDMA
Before you begin, this is what you need:
-An LTE micro sim.
-Do some research on which LTE bands your network uses and if your variant has the ability to use that band.
-Correct LTE APN settings for your mobile carrier. Make sure it is LTE APN, my carrier has two separate ones (Regular, LTE).
-Mobile Network does NOT have to be turned off (You can keep data on during all of this).
-With Mobile Network on, go into Settings -> About Phone -> Network and remember what is written under "Mobile network type".
-Make sure you are in a location that has decent LTE connection.
---------- Post added at 10:49 PM ---------- Previous post was at 10:41 PM ----------
O29C said:
EDIT: Clearly now that there are custom ROMs, this will be less likely an issue. But @icheyne pointed out a good method that will work on most ROMs I believe, since it uses Android's default testing menu.
For those seeking a permanent solution, you WILL need root.
Currently no permanent solution on LG Stock Lollipop.
Here is some information about my situation:
-Currently on Fido Network in Canada (LTE Band 7 [2600 MHz])
-I have achieved LTE speeds of 31mbps (Down) and 25mbps (Up).
-I am rooted, but it should work without root access.
-Firmware is stock V10h-TWN-XX
-Network mode only shows GSM / WCDMA
Before you begin, this is what you need:
-An LTE micro sim.
-Do some research on which LTE bands your network uses and if your variant has the ability to use that band.
-Correct LTE APN settings for your mobile carrier. Make sure it is LTE APN, my carrier has two separate ones (Regular, LTE).
-Mobile Network does NOT have to be turned off (You can keep data on during all of this).
-With Mobile Network on, go into Settings -> About Phone -> Network and remember what is written under "Mobile network type".
-Make sure you are in a location that has decent LTE connection.
METHOD FOR LG STOCK LOLLIPOP
1) Open up your Dialer, and type in the following to enter LG's Hidden Menu: "3845*#855#" for D855 (If your model is not listed, please do Google it!)
"3845*#850#" for D850
"3845*#851#" for D851
"3845*#852#" for D852
2) Go down and select "LTE-Only" and go into "Modem Settings"
3) Now select "RAT Selection" and click on "GSM/WCDMA/LTE auto"
4) Without rebooting, the data icon switched from "H" / "3G" to "4G" for the first time (Turn on Mobile Network if you haven't already)
5) Now go into Settings -> About Phone -> Network and under "Mobile network type" it should have "LTE" instead of what you had before
Currently no permanent solution, each time you reboot, switch to 2G/3G, or go into "Mobile Networks" menu, you will lose LTE
But it's okay, redoing steps 1 to 3 will get LTE back once again. Tedious, but at least it works
--------------------------------------------------------------------------​
QUICK METHOD (Working for all Jelly Bean ROMs & some Lollipop ROMs) (Thanks to @icheyne)
1) Go into Dialer -> Dial *#*#4636#*#* -> Phone Information
2) Scroll down to "Set preferred network type:" and click on the pull-down menu
3) Select what type of setting you want, I personally keep it on "LTE/GSM/WCDMA"
4) Select "LTE-Only" and go into "Modem Settings"
5) Without rebooting, the data icon switched from "H" / "3G" to "4G" for the first time (Turn on Mobile Network if you haven't already)
6) Now go into Settings -> About Phone -> Network and under "Mobile network type" it should have "LTE" instead of what you had before
7) [ROOT][Permanent LTE] For myself, I used a root explorer (ES File Explorer) and go into "/system/app" and delete (or move) LteConfigs.apk and LteConfigs.odex. Now you should be able to go into the "Mobile network" menu and it should have the "GSM/WCDMA/LTE auto" setting. Thus making LTE a permanent option.
Those without root access will lose LTE if they restart, switch to 2G/3G, or try to go into the "Mobile network" menu.
If you have any questions, please leave a reply. Hope this helped.
If anyone who cannot get this to work, please post with your details (firmware, carrier, LTE band, etc...).
Click to expand...
Click to collapse
Lg g3 d855.. Lte working fine using *#*#4636#*#*.. Today i upgraded to android 5.0 software.. But now *#*#4636#*#* not working on my phone... And lte is not working too..
Pls advise how to activate lte now
Click to expand...
Click to collapse
I really don't want to be condescending, but it's hard not to. Did you read the post?
O29C said:
I really don't want to be condescending, but it's hard not to. Did you read the post?
Click to expand...
Click to collapse
Lol was going to say the same
Sent from my LG-D852 using XDA Free mobile app

Can't set preferred network from testing menu

After the latest update, everything worked well until I noticed that I can't force phone to use certain network via testing menu (it can, however, from the setting itself).
Usually, by typing *#*#4636#*#* on dial pad, the system brought up the testing menu which allows me to see phone information, mobile and Wi-Fi usage information. By tapping phone information, the phone shows up the information of SIM1 (and even SIM2, depends on phone's system/ROM), along with the IMEI and other nerdy stuffs.
There is a dropdown selection called "Preferred network" (or something similar), which basically 'forces' the phone to use only the network selected (you can force phone to use LTE even on bad signal, which usually auto-switches to HSPA).
However, hours after the update, the dropdown menu seems useless and can't change the preferred network. Tried soft restart and hard restart and it still doesn't work.
What should I do, then? This doesn't really bugs me but it annoys me whenever I want to use only LTE network since it eventually switches to HSPA on bad signal.
i got the problem to.. cant lock lte after update. help please

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