Database Users

No Internet Connection via 3G/HSDPA...Blurry 3G icon on the taskbar...

The problem started yesterday, out frm nowhere. Till now, I still can't connect to the internet via 3G. Every time i tried to set up a data connection, this message appears "The answering modem has disconnected. To check your connection setting, tap Settings". I have no problem using WIFI or Active-sync. I had noticed that the usual 3G icon on top of the taskbar had become blurry.
Is it possible that my internal modem is no working. Please help..Thanks
(Using 1.66 ROM )

Same probem with me. Probably my SIM card have internet ban, because it is my biz SIM card. Tried with other SIM card and internet worked fine.

This means you have the blurry 3G icon earlier as well ? Tried other sim card and its still the same.

What is your provider? I had similar problem with my o2 here in Ireland. How I solved it: Just changed the APN to open.internet in network settings. It worked for me. Just search for recent change in the website of your providers. Good luck!

[Q] Limited Service, Emergency Calls Only - No Signal

Hello all!
I've made some searches, but I could not find a resolution to my problem (and very few people seem to have this problem!).
Sometimes, in Android only, my phone will drop signal to zero. This most often happens when coming out of sleep, but it happens sometimes when I'm just holding it, too.
I'm thinking that it most often happens when it switches from HSDPA to EDGE or from EDGE to HSDPA or when it gets a particularly strong cell signal (rarely, though; I'm on T-Mobile USA).
I've read about PPP drops, but I don't think this is the same--in my case, the signal just goes to nothing. It's like I'm in a basement. No voice calls, no SMSes.
Once, I was able to get to the choose-a-network-screen; there, I chose T-Mobile, and it told me that the SIM was not the correct one for the network. Other times, I've gotten to that screen and T-Mobile could be chosen. Another time, it'll give me an "error when searching for networks."
Does anyone have any suggestions for this?
Thanks!
Edit: I thought I'd clarify; this happens across every Android build. I've tried 15 and 14 radios. The Europeans seem to have this too: http://forum.xda-developers.com/showthread.php?t=796713 ... Is there a solution for this? Thanks!

Have you tried using secret setting to get onto phone options and change cdma preferred to gsm auto prl. I used to have this problem too. Dial *#*# 4636#*#* to get to those settings or download free app "secret phone setting" from market. Hope this helps.
Sent from my HTC HD2 using XDA App

gumataotao said:
Have you tried using secret setting to get onto phone options and change cdma preferred to gsm auto prl. I used to have this problem too. Dial *#*# 4636#*#* to get to those settings or download free app "secret phone setting" from market. Hope this helps.
Sent from my HTC HD2 using XDA App
Click to expand...
Click to collapse
Hi,
Thanks for your input! Unfortunately, I think this disables 3G in general as well... do you know of a workaround that still lets me keep 3G?
Thanks!
Edit: My apologies; other solutions that have mentioned GSM seem to think that it keeps it at 2G. Looks like this might work, even for 3G! I'll keep y'all updated. Thanks again!

How does this work for you?
I have ths same problem, and I can't get the 3G to work regardless of all the setting.
Also tried the secret setting.
Still limited service
Using tmobile usa, t-zones, rafdroid 3.0
Was okay and slightly on and off intermittently until yesterday, totally lost connection.
Please help

Hi,
Did anyone here able to resolve the problem? I have exactly the same problem. I am on T-Mobile US (HTC sensation 4G), my phone has stopped picking up any signal. It always shows "limited service/no signal". T-Mobile customer center is saying that there is no issue of signal strength in my area. In the phone, under wireless and netwoks setting, I am unable to check "mobile network" option too. I did factory reset too but thats also not working. I have also contacted T-Mobile and tried using the settings they provided for APNs but that did not work too?
I tried searching at various places but no one seems to have faced this issue. Any help on this issue would be appreciated.
Thanks in advance.

Limited Service, Emergency Calls Only - No Signal
Our HTC HD2 is showing Limited Service, Emergency calls only.
We are running Android From NAND by aMAGLDR V1. 11 build DEC 31 2010 Cotulla 2010. The Limited Service, Emergency calls only began today
at 9am and the issue hasn't been resolved.
Is there any step by step suggestions?
Changed secret settings WCDMA to
GSM auto (PRL) with no resolution.
Would a hard reboot resolve this issue? How is a step by step hard reboot performed on the HTC HD2?
Thanks in advance.....

First step tho I'm sure you tried this already would be to reseat the sim card, followed by testing the sim in another phone, then another sim in the hd2.

samsamuel said:
First step tho I'm sure you tried this already would be to reseat the sim card, followed by testing the sim in another phone, then another sim in the hd2.
Click to expand...
Click to collapse
samsamuel:
Thank you for your response.
This solution was tried and hasn't resolved the issue.
UPDATED: aMAGLDR V1. 13 build FEB 1, 2011 Cotulla 2011. (Hasn't resolved issue)

i you can put another t-mob sim in phone,or if unlocked,any sim in and look in android settings,phone info,that the phone number is changing when sim changed,have had problem with 3uk sims and some other sims that the phone does not appear to notice that the sim/ number has changed ,some services will work,others wont..
ang get same prob hunting for providers failing.
perhaps android has a bug.
could be faulty antenna connector on phone.
could be worn/damaged sim or sim holder in phone.
could be t-mobs problem their end.
sorry not more help,good luck.
hopefuly other members know more about problem.
grraagghj.spirff.spfheey.
i want mind control keyboard for htc phones before i go barmy !!!!
Sent from my HTC Sensation using xda premium

tleaf100 said:
You can put another t-mob sim in phone,or if unlocked,any sim in and look in android settings,phone info,that the phone number is changing when sim changed,have had problem with 3uk sims and some other sims that the phone does not appear to notice that the sim/ number has changed ,some services will work,others wont..
ang get same prob hunting for providers failing.
perhaps android has a bug.
could be faulty antenna connector on phone.
could be worn/damaged sim or sim holder in phone.
could be t-mobs problem their end.
sorry not more help,good luck.
hopefuly other members know more about problem.
grraagghj.spirff.spfheey.
i want mind control keyboard for htc phones before i go barmy !!!!
Sent from my HTC Sensation using xda premium
Click to expand...
Click to collapse
tleaf100:
When T-Mobile opens we will install new SIM.
The HTC HD2 is new so have no idea if the issue is
any of the above you listed. T-Mobile has the best service plans
but the worst customer service.
We require a true unlimited plan because 90% of our calls are
to landlines.
Thanks for your response.
HTC HD2 running Android.

Required sim card upgrade!
7 NOV 2011 UPDATE ON LIMITED SERVICE, EMERGENCY CALLS ONLY!
Visited a T-MOBILE store and the SIM card was 2G and they upgraded
the SIM card. It resolved the issue.
We thank everyone who contributed to this issue.
T-MOBILE representative stated the HTC HD2 could never achieve
4G. Attempted to upgrade us to a Galaxy 4GS II. We will never
pay retail for a phone.
HTC HD2 running Android.

Network Mode
I had this issue as well on my HTC Sensation. What worked for me was to set Network Mode to "GSM Only" (Settings/Wireless & Networks/Mobile Networks/Network Mode).
It was weird, when I had 4 bars I could make/receive calls, but when reception was 2-3 bars it wouldn't. It has been less than 24 hrs so not completely sure the problem has gone away but worth a shot.
Bonne chance.

My solution
Hey Guys!
I had the same problem after upgrading my Moto Milestone 2 to 2.3.6 Vivo ROM. When I went to class at university I had "Emergency calls only" - not "limited service" or "no service". So I had receiption... Also I could select any other provider but not my own (T-Mobile Hungary). The same thing happened when I was at home, in the house. The strange thing was that I didn't have any problem at any other place. Also, when I locked my screen and didn't use the phone, I had bars and could receive calls&sms, but after waking up the phone, the bars went down to 0 and got the "Emergency calls only" message.
I Googled a bit and found an answer which was worth a try before asking for a new SIM card from my provider ('cause that was the only solution I found in every other forum).
So the things to do are:
dial *#*#4636#*#*
go to Phone information
Scroll down to "Set preferred network type"
Select "GSM auto (PRL)"
My default was "GSM only" and after setting to auto I had full bars.
One thing to note: I don't use 2G or 3G or 4G or any other G. I just use WiFi for browsing and other than that, GSM to receive calls and send SMS. If you need 3G I think you need to change to some other settings. But you should give it a try.
Cheers!

Emergency calls only; When Android pie sleeps
I notice several times since I loaded Android Pie on my Oneplus One that the system, to save battery, is shutting down apps, even system apps. One of these is the phone service causing my phone to read Emergency calls only. After picking it up, about 30 sec, it registers 3 bars as normal. I am concerned that I am missing calls and text messages because after it turns on I get text messages. So, what is going on here? Any Ideas?

[Q] unlocked tmobile hd2 no data connection??? please help

i have a tmobile hd2 and its carrier unlocked i am using it with ATT and i just recently lost all data connection to my phone. i have an unlimited data plan that was working perfect until just recently. no internet or mms not even weather!! only can use wifi. can anyone help? thanks

Have you tried
*#*#4636#*#*
dial this and then go to phone information.
Have you run the ping test?
Checked what Current Network says?
Checked to see if there is anything listed under =======DATA======= ?
Have you tried to put a friend's TMO sim in the phone to see if data is restored?
All the data you can provide could help solve your problem. As is, the problem might be a little ill defined.

Lrggenius said:
i have a tmobile hd2 and its carrier unlocked i am using it with ATT and i just recently lost all data connection to my phone. i have an unlimited data plan that was working perfect until just recently. no internet or mms not even weather!! only can use wifi. can anyone help? thanks
Click to expand...
Click to collapse
If you are running Windows Mobile on your HD2 from the home screen touch onvStart Menu/Settings/Menu/All Settings/Connections/Connections. Then tiuch on the adcanced tab and then touch on Select Networks and make sure AT&T is the selected network. Also tiuch on the Task tab and select Manage Existing Connections. While on the Modem tab make sure AT&T is selected and under the Proxy Settings make sure the box beside "This network connects to the internet" is checked.
Ok if you are running Androud then go to Settings/Wirless & Networks make sure allow data connections box is checked. Also go to Networks/Vertualy private networks (VPN) and make sure your AT&T VPN is corrwct.

i have fixed the problem! i was running the tmobile 3.14 rom udate which sucked and i just flashed an energy rom and alll is working again thanks for the suggestions

Same Problem
Someone please help and know that I know little to nothing of technical terms! I have the same problem. I have a T-mobile Hd2 and had Android put on it. Right at first I had a data connection then all of a sudden-NO DATA. I'm so frustrated! I checked the setting for using the phone as data connection SEVERAL time. I can get wifi but no data otherwise. PLEASE HELP

Try:
Menu - Settings - Wireless and networks - Mobile network - Access Point Names - menu button - restore to defaults, and follow the simple instructions
This should place the latest APN from your carrier on to the phone - may need a soft reboot

nenol said:
*#*#4636#*#*
dial this and then go to phone information.
Have you run the ping test?
Checked what Current Network says?
Checked to see if there is anything listed under =======DATA======= ?
Have you tried to put a friend's TMO sim in the phone to see if data is restored?
All the data you can provide could help solve your problem. As is, the problem might be a little ill defined.
Click to expand...
Click to collapse
Hi, I'm currently trying to get my T-Mobile HD2 to work properly on NTT docomo, a Japanese cell carrier. I moved here at the end of May and have been using a data-only SIM through bmobile, a provider that uses the same towers as NTT docomo and it worked perfectly, however I switched to a voice and data plan and now I have no data connection. Voice works fine though.
I followed nenol's steps and under =======DATA======= it says, "State: DcInactiveState disconnected with last try at 9:49PM fail because Activation Reject GGSN" What now? Ha

[Q] Nexus 4 data radio problem?

I'm a smartphone noob [though slightly above-average with technology in general] - the Nexus 4 is my first smartphone, and I've been lurking here for a week looking for all possible solutions for my problem and none have worked, so please bear with the longish post:
Nexus 4 16GB, bought from the US Play store - using it since Monday, Dec 10. I'm using it with a Straight Talk AT&T SIM, and I have *no cellular data* whatsoever. I have been using the phone for a week now, and I haven't been able to use the internet except on wifi. No 3G/EDGE/HSPA+ logos next to the signal bars - in fact the signal bars always grey when wifi is off. I have only seen the signal bars turn blue when the wifi is on, never on a cellular network.
APN settings have been verified, and tens (yes, TENS) of Straight Talk reps have said my account seems to be provisioned correctly and good to go. I have tried all the alternative APN settings suggested for Straight Talk on various forums, including the two-APN configuration for MMS and data, deleting the data proxy from the APN settings, reverting to the default APN settings on the SIM and even using the Straight Talk T-Mobile APN [though I know for sure mine is an AT&T SIM because T-Mo doesn't cover my workplace, where I have good signal strength].
My old device was an AT&T locked dumbphone, so I couldn't change the APN settings on it to use the data on StraightTalk, but when I put my Straight Talk SIM in, it shows the 3G logo next to the signal bars suggesting that my StraightTalk account is probably provisioned correctly for data.
Hard reset, repeated reboots and repeated toggling of data and airplane modes have all been tried, and nothing has changed the situation. I have perfect voice and text messaging connectivity and zero data.
As a smartphone noob - is there a separate radio in the phone for data connections, and is it possible that this radio alone is a lemon on my phone? I *do not* have access to another micro-SIM, unfortunately - CDMA is popular in my town and the only two of my friends who have phones with removable SIMs probably won't appreciate having their regular SIMs cut down to micro for me to test. Without being able to test it, I don't know if I should just RMA it either.
***UPDATE*** : FIXED
I got a T-Mobile SIM to test the phone, and data worked perfectly well on that, so I concluded it probably wasn't the phone. T-Mobile wasn't an option for me though, because they have crappy reception in most of my town.
Happened to travel to Boston, tried my StraightTalk SIM in a friend's phone there - data worked fine then. So now I didn't know if it was the phone or the SIM.
After three weeks of grief and fighting, I got StraightTalk to send me a replacement SIM, which fixed the issue immediately - I had full HSPA data connectivity within five minutes of dialing their number to have my SIM activated.

Turn on Mobile data?
Have you enabled the 3G/mobile data switch built into android? Settings > Wireless & data > More > Mobile Networks > data Enabled Tick that if its unchecked, Im still waiting for mine but my HTC explorer running a vanila flavour of ICS has a similar settings menu, its somewhere along those lines bud, post back with results. As i said might be in a different location due to the differing OS versions
Good luck mate, Blewk
EDIT: Nevermind ive just opened my eyes and noticed you've tried it xD
so try calling this number *#*#4636#*#* and going through each of those settings (apart from LTE of course) see if any of them give you a Data connection. constantly checking the data switch on the phone at all times though making sure its enabled If this offers no luck im out of ideas for you mate
Blewk

Blewk said:
Have you enabled the 3G/mobile data switch built into android? Settings > Wireless & data > More > Mobile Networks > data Enabled Tick that if its unchecked, Im still waiting for mine but my HTC explorer running a vanila flavour of ICS has a similar settings menu, its somewhere along those lines bud, post back with results. As i said might be in a different location due to the differing OS versions
Good luck mate, Blewk
Click to expand...
Click to collapse
Thank you, but I have done that too. That isn't restoring connectivity.

irsquared said:
APN settings have been verified, and tens (yes, TENS) of Straight Talk reps have said my account seems to be provisioned correctly and good to go. I have tried all the alternative APN settings suggested for Straight Talk on various forums, including the two-APN configuration for MMS and data, deleting the data proxy from the APN settings, reverting to the default APN settings on the SIM and even using the Straight Talk T-Mobile APN [though I know for sure mine is an AT&T SIM because T-Mo doesn't cover my workplace, where I have good signal strength].
.
Click to expand...
Click to collapse
So what are your APN setting? Can't really trust CSRs since they aren't using a Nexus 4 to test themselves.

Hung0702 said:
So what are your APN setting? Can't really trust CSRs since they aren't using a Nexus 4 to test themselves.
Click to expand...
Click to collapse
I've attached screenshots with the current settings, which are the ones the CSRs recommended.
I have also tried
deleting the proxy+port
changing both proxies to addressort format
changing the APN type to "default,supl,mms".
editing the SIM's default APN values to these, instead of creating a new APN.
and various combinations of these. None of these have helped. (I reboot and wait 30-45 minutes after every change in these settings).
EDIT: addressort is address(colon)port. Forgot to disable smilies.

Try changing your MMS Proxy to 66.209.11.33 see if that helps. Its the only difference I can see.
Sent from my Nexus 4

riko540 said:
Try changing your MMS Proxy to 66.209.11.33 see if that helps. Its the only difference I can see.
Sent from my Nexus 4
Click to expand...
Click to collapse
Thank you, I've tried that too. Since my other phone (without the correct APN) still shows the 3G logo next to the signal bars and the Nexus 4 doesn't show any data speed indications, is it safe to assume the issue is with the device and not the network?

Blewk said:
so try calling this number *#*#4636#*#* and going through each of those settings (apart from LTE of course) see if any of them give you a Data connection. constantly checking the data switch on the phone at all times though making sure its enabled If this offers no luck im out of ideas for you mate
Blewk
Click to expand...
Click to collapse
Thanks. I was trying just that (saw the *#*#4636#*#* code on another forum), and none of the options work. I'm wondering if that means my radio is dead. I don't want that to be the case, but I can't think of another explanation

You appear to not have an APN type set up.
Sent from my Nexus 4 using Tapatalk 2
Edit: use these settings. Except in the first APN remove the first proxy line.
http://wirevalley.com/ultimate-apn-settings-for-straight-talk-with-android/
Edit 2: yes you do have apn type... My bad. Haha

irsquared said:
Thanks. I was trying just that (saw the *#*#4636#*#* code on another forum), and none of the options work. I'm wondering if that means my radio is dead. I don't want that to be the case, but I can't think of another explanation
Click to expand...
Click to collapse
I think I have the same problem as the OP. In my case, the HSPA radio connects about 50% of the time after a reboot. In my case, I'm convinced that the loss of signal is attributed to failure to communicate with the SIM card.
For the OP: Are your signal bars grey? or is it just an outline of a triangle on its side? If it's just an outline, the phone sees the SIM card, but cant retrieve the necessary data. To confirm, install a SIM info app from the Play store and see if the app see all details of the sim card.
I have already replaced the sim card, assuming I had a defective SIM, but the new card has not resolved the issue.
At this point, I think I need to RMA my phone.

Dr Zoidberg said:
For the OP: Are your signal bars grey? or is it just an outline of a triangle on its side? If it's just an outline, the phone sees the SIM card, but cant retrieve the necessary data. To confirm, install a SIM info app from the Play store and see if the app see all details of the sim card.
I have already replaced the sim card, assuming I had a defective SIM, but the new card has not resolved the issue.
At this point, I think I need to RMA my phone.
Click to expand...
Click to collapse
It looks like the SIM details are being seen - I have voice and texting capabilities, and my signal bars are present but grey. Sorry to hear about your phone - my data connection is out 100% of the time though.
I've ordered a T-Mobile SIM to check this out - this way I should be able to figure out whether it's the network or the SIM.

Update: I've tried a T-Mo SIM and it works perfectly. So it's not the device.
However T-Mo isn't actually a viable option for me because they have very limited coverage where I live. Straight Talk keep telling me their provisioning is okay - any way to check on this? What other issues could I possible have that might be causing this?

irsquared said:
Update: I've tried a T-Mo SIM and it works perfectly. So it's not the device.
However T-Mo isn't actually a viable option for me because they have very limited coverage where I live. Straight Talk keep telling me their provisioning is okay - any way to check on this? What other issues could I possible have that might be causing this?
Click to expand...
Click to collapse
Are you sure you have AT&T 3G coverage near you? I looked on AT&T's map for my work place and it shows 3G coverage but the entire county only gets 2G EDGE. And EDGE is horribly slow, I can't download anything. Went to Wal-Mart there and went to the wireless store and they confirmed that there is no 3G coverage in the area except for Verizon (which I had before this phone). I have an app called Network Signal Info, it will tell you what type of data network you are connecting too even when on wifi. It tells me EDGE2 at work HSPA at home.
https://play.google.com/store/apps/details?id=de.android.telnet&hl=en Network Signal Info
Edit: just wanted to add that I read somewhere in a thread here that the colors blue and gray only signify if you are connected to google services or not. Blue you're connected, gray you're not.

kzoodroid said:
Are you sure you have AT&T 3G coverage near you?
Click to expand...
Click to collapse
Dead sure - as I said in my original post, I put my SIM back in my old (locked) dumbphone and it shows the 3G logo - though I can't use data on that phone because I'm locked out of the APN settings. And colleagues at work with have HSPA+ on AT&T. I can't try their SIMs though, because they don't use micro-SIM.
As for signal bar colours - even if there is no Google connectivity, it should at least show me a 3G or H/H+ next to the signal bars, which doesn't happen - and I cannot access anything on the internet anyway. I tried actually accessing the internet via the browser and various apps, I'm not deciding my connectivity based on the bar colours.

ALSO: When I use *#*#4636#*#* to turn the radio off and then on again, "GPRS service" goes to "connecting" but eventually stops at "disconnected". And the "network type" in that menu says "HSPA", so it looks like the network is kicking me off though I can't for the life of me say why that's happening.

Dr Zoidberg said:
I think I have the same problem as the OP. In my case, the HSPA radio connects about 50% of the time after a reboot. In my case, I'm convinced that the loss of signal is attributed to failure to communicate with the SIM card.
For the OP: Are your signal bars grey? or is it just an outline of a triangle on its side? If it's just an outline, the phone sees the SIM card, but cant retrieve the necessary data. To confirm, install a SIM info app from the Play store and see if the app see all details of the sim card.
I have already replaced the sim card, assuming I had a defective SIM, but the new card has not resolved the issue.
At this point, I think I need to RMA my phone.
Click to expand...
Click to collapse
I'm constantly get this issue where the signal bar becomes just an outline every minute or so and I lose connection. When this is happening sms becomes erratic (I receive texts multiple times sometimes 20-30 minutes after it was first sent, texts are received in the wrong order, cannot send texts until i restart phone).
Possibly hardware issue?

I had the same problem... could connect to the wireless network only if wireless data was disabled or WIFI was on.
Ordered a replacement which came today, and all is good Seems to be a hardware issue.

irsquared said:
I'm a smartphone noob [though slightly above-average with technology in general] - the Nexus 4 is my first smartphone, and I've been lurking here for a week looking for all possible solutions for my problem and none have worked, so please bear with the longish post:
Nexus 4 16GB, bought from the US Play store - using it since Monday, Dec 10. I'm using it with a Straight Talk AT&T SIM, and I have *no cellular data* whatsoever. I have been using the phone for a week now, and I haven't been able to use the internet except on wifi. No 3G/EDGE/HSPA+ logos next to the signal bars - in fact the signal bars always grey when wifi is off. I have only seen the signal bars turn blue when the wifi is on, never on a cellular network.
APN settings have been verified, and tens (yes, TENS) of Straight Talk reps have said my account seems to be provisioned correctly and good to go. I have tried all the alternative APN settings suggested for Straight Talk on various forums, including the two-APN configuration for MMS and data, deleting the data proxy from the APN settings, reverting to the default APN settings on the SIM and even using the Straight Talk T-Mobile APN [though I know for sure mine is an AT&T SIM because T-Mo doesn't cover my workplace, where I have good signal strength].
My old device was an AT&T locked dumbphone, so I couldn't change the APN settings on it to use the data on StraightTalk, but when I put my Straight Talk SIM in, it shows the 3G logo next to the signal bars suggesting that my StraightTalk account is probably provisioned correctly for data.
Hard reset, repeated reboots and repeated toggling of data and airplane modes have all been tried, and nothing has changed the situation. I have perfect voice and text messaging connectivity and zero data.
As a smartphone noob - is there a separate radio in the phone for data connections, and is it possible that this radio alone is a lemon on my phone? I *do not* have access to another micro-SIM, unfortunately - CDMA is popular in my town and the only two of my friends who have phones with removable SIMs probably won't appreciate having their regular SIMs cut down to micro for me to test. Without being able to test it, I don't know if I should just RMA it either.
Click to expand...
Click to collapse
I to am having the same problem connecting to data networks. I have had the nexus 4 for about 2 weeks and its been an amazing phone until this morning when I had no data connection in town and around town. My iPhone 4 has 3G connection in the same area, with the same sim card. Ive already looked around the net and found the post to reset the radio but nothing happened. After not having radio or data for about 2 hours my phone finally fixed its self. I have no clue why I lost data connection or how it fixed its self. I will stay posted to see what happens but maybe there is some bad hardware in the device that is just now starting to surface.???

Hi I appear to have the same problem. My phone is able to make calls/text and etc with data off but when data is turned back on it screws around, doesnt connect to the internet, grey outline on service and etc. I'm thinking this is an hardware issue but how would I go and exchange this. One more thing, I bought this brand new from someone, does that matter?

Lowkey1 said:
Hi I appear to have the same problem. My phone is able to make calls/text and etc with data off but when data is turned back on it screws around, doesnt connect to the internet, grey outline on service and etc. I'm thinking this is an hardware issue but how would I go and exchange this. One more thing, I bought this brand new from someone, does that matter?
Click to expand...
Click to collapse
If you want to RMA your phone, you can transfer the ownership by calling Google Play support. You will need the device IMEI and the email address of the original purchaser. Just tell them the phone was gifted to you. After the ownership is transferred, you can begin the RMA process.
Sent from my Nexus 4 using xda premium

network problem

Anybody facing network issues in a51? Sometimes i lost the internet completely. I have tried different sim cards, edited APN, formatted same problem. I can't sort out the issue is from phone or network provider. How can sort out the issue with phone or sim card? Pls help, so that i can return my phone.

nithambu said:
network issues
Click to expand...
Click to collapse
Hello. I have the problem occurred when there were two SIM cards in the phone and the Internet was from the second SIM card. if leave one SIM card in the first slot and the second remove the problem disappeared. It was found out that this depended not on the phone but on the specific SIM card and its firmware. what may have a you problem can not tell. im said that he knew. thx.

Apparently from the tests performed, it is a problem in the LTE mode, since I switched to UMTS (3G), I no longer had connectivity problems. I hope that the problem can be corrected by Samsung, in a next update.
PS: Needless to say, I stopped having 4G communications !!!

Is or was your problem in any way similar to mine?
https://forum.xda-developers.com/galaxy-a51/help/samsung-a51-disconnects-cellular-network-t4160527