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Permanent Fix for intermittent data issue on CM9/10/AOSP 4.0+ based ROMs

After months of having this reoccurring issue myself, I FINALLY figured out a solution. It had gotten so bad on mine that wiping the rom won't matter... the only solution was to wait for several minutes/hours until it returned or switch to a Sense-based or a GB rom. This fix should appeal to those who had to return to older roms due this issue driving them insane!
Let's clear up a few things first.. to those having this issue and being able to restore data by going into airplane mode might wanna invest in a new sim card. Best to go into a retail location and pick one out yourself. The newest ones (model number TM9177 or higher) work the best and have the fewest data drop offs. That should fix a lot of users intermittent data issues from returning.
If you still have data issues and already have a newer model sim card (TM9177 or higher) OR have data issues that don't get fixed after a reboot, switching into airplane mode, wiping, normally have to wait a long time for it to return on its own, etc.... then this part will fix it. :highfive:
Go to home, menu, settings, wireless & networks, more, mobile networks, access point names, menu, and FINALLY add a new apn. Chose whatever for name of apn (maybe tmobile alternate, tmobile 2, or whatever), the next line, the actual apn, with be "wap.voicestream.com" (no quotes, duh). Next add this line to MMSC... "http://mms.msg.eng.t-mobile.com/mms/wapenc". Everything else should be left as is. Now hit menu, save apn. This new apn seems to work with all features I've tried... text messaging, full data access, same speed as default epc.tmobile.com apn, tethering, etc. Haven't tried MMS but the settings for that line is there in our alternate apn we just made. Please post results on that if anyone still uses that feature So... that's it. The old apn works nicely and you say GO TO HELL! to the annoying data icon flashing on and off forever!
Be sure to post your results/experiences to confirm but it seems to be gone on 4 other MT4GS CM9/10 users besides my own. I REALLY HOPE y'all are as happy with this fix as much my family, friends, co workers, and I are! Do forget to use the thanks button
Also... you can try "internet.voicestream.com" for an additional apn. I'm not sure if MMS will work on that one even with the MMCS set as "http://mms.msg.eng.t-mobile.com/mms/wapenc" but it's work a try. If anyone wants to check it out is welcome to. Again... post your results. I'm not sure how long tmobile will leave these old apns active but I bet it's longer than anyone will be still using this model lol! Enjoy!

I've been one of the lucky ones not to have had this problem but if this fixes the issue of those that have been, this is one NIIIICE CATCH! GOOD WORK, sino8r!!
I'm very anxious to hear how this works out for everyone!

Intermittent Data 3G 4G Loss Disconnect
Wow, Thanks. I've been fighting with this all day.
I've been running SilverL CM 10.1 for a couple of weeks and today suddenly lost my T-Mobile data connection.
I tried many solutions (I wish I'd found this thread sooner). Wiping Cache, Fix Permissions, Reflashed, different Kernals, different loads. Going back to Gingerbread worked, but I lost the data when I went back to ICS/JB.
There was even another thread that was close with deleting all APNs and creating a new one, but the settings still weren't there.
This took care of it right away.
THANKS !!!!

Problem with t-mobile service, signal
Would u be able to help me with this problem? http://forum.xda-developers.com/showthread.php?t=2203084

Sir You just saved my phone and my sanity thank you so much !!!!!!
---------- Post added at 07:29 PM ---------- Previous post was at 07:00 PM ----------
Ratler5 said:
Sir You just saved my phone and my sanity thank you so much !!!!!!
Click to expand...
Click to collapse
Tested it with 2 diffrent JB roms fixed data problem in about 10 seconds from selectign new APN. Data speeds are back to normal! Will update if anything changes.

After several days even weeks of no issue then suddenly I get data issues again so I go back to mobile networks to find the second APN I created to be deleted... Anyone experience this?
Sent from my MyTouch 4G Slide using xda premium

thanks for the info! i ran across this thread while searching for a new ROM for my mytouch 4g slide, hoping it would fix the issue. once I arrived to the access point names, i noticed that the apn selected was for LTE. I switched to the regular one and now it works great. thanks!

I had this issue while on cm9 releases but it had gone away after I began using unofficial 10.1. Sort of. In certain areas- and I assume with certain towers - my data wouldn't work with some apps (ie., Facebook, Google maps) even though the data icon would show "H" or "3g" locked on and blue consistently. Sure enough, this fixed it right up.
Also, although my phone shows the option for the Tmobile lte APN in the settings, it was not selected by default. Thanks for this!
Sent from my MyTouch 4G Slide using xda app-developers app

[Q] Need help with connectivity issues. DESPERATE

Hey guys, quick background. I bricked my SGS3 and had to have it replaced. I think I got a refurb phone because from day one I keep having the same issue. First day I got the replacement phone I rooted it and flashed CleanROM 5.0. Everything was peachy until I noticed that I have no 4G or 3G service. In fact, I had no data connectivity at all. My phone can make calls, receive texts no problem, won't connect to internet. If I restart the phone, I have 4G right away. After a few minutes, the 4G icon is on, but the phone won't has no data connection (when I say data connection I mean it will not go online, no internet, no android market, still have voice and txts). If I attempt to go on internet, I get a message saying "No Signal Found For Mobile Networks". I have installed Network Signal Info and right after a restart it says 4G LTE, data connected, upload+download activity. After a few minutes, it says 4G LTE, data connected, after a little while, it will switch to EHRPD, with data "connecting". Also, in the System tab, it will tell me my IEMI and version of JB running, next to "Radio", it says "unknow". WiFi works perfectly btw. My IEMI is perfectly fine,
I had it backed up. My phone number is still there.
Here is what I had tried so far: Switching into and out of Airplane mode, different programs that reset mobile connection, flashed different custom ROMs, flashed the stock kernel, flashed 3 or 4 verizon Modems, Data wipe, cache, Dalvik wipe, Odin'ed back to stock 4.0.1 ICS and had upgraded it to 4.1.1 via verizon software update, changed the SIM card, and reprovisioned the phone with that *3767*whatever the hell code. I'm out ideas.
If anyone has any other idea that I can try before I take it back to Verizon, please, let me know.

tim.janov said:
Hey guys, quick background. I bricked my SGS3 and had to have it replaced. I think I got a refurb phone because from day one I keep having the same issue. First day I got the replacement phone I rooted it and flashed CleanROM 5.0. Everything was peachy until I noticed that I have no 4G or 3G service. In fact, I had no data connectivity at all. My phone can make calls, receive texts no problem, won't connect to internet. If I restart the phone, I have 4G right away. After a few minutes, the 4G icon is on, but the phone won't has no data connection (when I say data connection I mean it will not go online, no internet, no android market, still have voice and txts). If I attempt to go on internet, I get a message saying "No Signal Found For Mobile Networks". I have installed Network Signal Info and right after a restart it says 4G LTE, data connected, upload+download activity. After a few minutes, it says 4G LTE, data connected, after a little while, it will switch to EHRPD, with data "connecting". Also, in the System tab, it will tell me my IEMI and version of JB running, next to "Radio", it says "unknow". WiFi works perfectly btw. My IEMI is perfectly fine,
I had it backed up. My phone number is still there.
Here is what I had tried so far: Switching into and out of Airplane mode, different programs that reset mobile connection, flashed different custom ROMs, flashed the stock kernel, flashed 3 or 4 verizon Modems, Data wipe, cache, Dalvik wipe, Odin'ed back to stock 4.0.1 ICS and had upgraded it to 4.1.1 via verizon software update, changed the SIM card, and reprovisioned the phone with that *3767*whatever the hell code. I'm out ideas.
If anyone has any other idea that I can try before I take it back to Verizon, please, let me know.
Click to expand...
Click to collapse
Did you go into your mobile data settings to make sure you're on CDMA/LTE? If not I would select and reboot the phone and see if the problem persists. I don't know if you have tried this but it's worth a shot.

I'm having literally the same exact problem with my mom's S3 except for it's not rooted, complete with 'download + upload activity' and 'unknown' radio. I've yet to find anything in my search, but if I do I'll post it here.

sju1fan said:
Did you go into your mobile data settings to make sure you're on CDMA/LTE? If not I would select and reboot the phone and see if the problem persists. I don't know if you have tried this but it's worth a shot.
Click to expand...
Click to collapse
I did try that. Nothing seems to be working.

Installed CM 10.2.1 and now have no service

Okay so last night I installed CM 10.2.1 on my Samsung galaxy S3 (Verizon SCH-1535)
Everything's running smoothly but for some reason I don't have any service anymore
I'm using a Family Mobile SIM card and APN, still have my IMEI and MEID but in the phone status screen PRL version, MIN and my phone number show up as unknown. Also it says that my mobile network state is disconnected.
Right now I can't send texts and call anyone. However I still do get automated billing texts...
Not sure what to do right now. I still have a CWM backup of the stock ROM. I'm rather new to this custom ROM and bootloader thing so I'm worried that I'll accidentally brick my phone.

Nevermind, i fixed it!

What did you do to fix this? I've had almost the exact same experience over the past couple of days but haven't managed to recover my service.
Background: Flashed back to Alliance 23 (TW 4.3) to see if TW would solve anything and it didn't. I've flashed the ML1 modem and NE1 and still nothing. I even went to a Verizon store to replace my SIM in case the PRL got botched somehow. I can receive texts and send texts sometimes but not consistently, cannot make or receive phone calls.
On Alliance I have the CDMA/LTE/EVDO network mode selected (defaults to global). I was previously trying out CM12.1 and had issues with the modem type sticking to LTE/CDMA (auto prl), after reboots it would switch back to LTE/GSM and the network modes presented were LTE, 3G, and 2G which didn't seem right.
The last time I had a fully functioning radio was with SlimKat Stable. Was having issues sending/receiving MMS and figured it was time to upgrade so went to CM12.1. Since I've tried flashing Alliance and other versions of CM I don't think flashing back to SlimKat will do much but I guess that's next on my list..
I feel like I'm missing something simple. Anyone have ideas?

Jeremy.Stewart85 said:
What did you do to fix this? I've had almost the exact same experience over the past couple of days but haven't managed to recover my service. ...
Click to expand...
Click to collapse
I may have managed to fix this. Remembering the IMEI issues that happened early on in this phone's life I figured it might have something to do with that.
My IMEI was correct in my phone status, however my phone number and MIN were not correct (phone was 000-000-0023 or something strange) and my MIN was 00. Something definitely broken there.
Steps:
It requires you to have an IMEI backup already. I had done the reboot nvbackup from adb ages ago and decided to give it a shot with a reboot nvrestore.
Phone rebooted but was stuck on the Samsung logo...uh oh.
Had to do a battery pull and reboot to recovery manually.
Restored Alliance 4.3 backup and voila! Full service, phone number and MIN were correct.
Restored my CM12.1 backup image I had been trying out. Right off the bat there was still the same issue of no service.
Dialed the phone info menu (*#*#4636#*#*) and changed preferred network type to CDMA only, ping test succeeded.
Went to Settings | Mobile Networks and things looked more normal which was a great sign. My Preferred network type was actually blank, so I selected LTE (recommended).
Tried a test call to #832 and success!
Rebooted to make sure everything sticks and it does.
That was not a fun experience...still not entirely sure what actually broke but I've got a usable phone again and to top it off it's on CM12.1 which is just awesome so far

LineageOs No Cellular Data after initial install.

So I 'sideloaded' LineageOs on my stock OPO the other day with the current TWRP, and have not had mobile data since. I have searched around a bit and found on the OPX that they have a fastboot flashable bootloader that fixes the issue there. Do we have anything like that here that doesn't involve going back to stock? Or does anyone know a fix for this issue?
used adb sideload to install TWRP.
Then used sideload to install lineage and nano gapps in TWRP.
Went a day without realizing I had no data.
Started toggling airplane mode. Redid apn that was already there. Reboots etc.
Searched around on xda.
Downloaded and flashed most recent c7 modem.
Searched around on xda.
Making this post.
Thanks for any help.

Looks like I got it fixed. Through my searching I saw where peeps are able to stick in another sim and get data to work. So I decided to call ATT gophone.
Turned off wifi.
Turned off cellular data.
Went to APN and changed the apn (ATT Go Phone) from pta to nxtgenphone.
Turned on cellular data.
Finally had H+ above he signal bar, but had an X inside the bar.
Don't know if he did anything on his end, but the X went away after a couple of minutes.
Data was working, albeit kinda slow.
Turned off phone for three minutes per ATT rep.
Rebooted.
Data still slow, but it is at least working. Thinking I need to flash different modem. Battery usage has been higher the last day or two since I flashed c7 anyways.

Thank you
This worked for my Honor5x l22 version with an Att gophone sim card. Im forever in debt.

Thanks! This msolved the problem for me.
I installed (and reinstalled) LineageOS on my Note 3 and nothing could fix mobile data. This post saved the day.
I had to do one more change:
APN type -> default,mms,supl,hipri
Detailed settings are available at https://www.att.com/esupport/article.html#!/wireless/KM1218306?gsi=6Bft054
phermey said:
Looks like I got it fixed. Through my searching I saw where peeps are able to stick in another sim and get data to work. So I decided to call ATT gophone.
Turned off wifi.
Turned off cellular data.
Went to APN and changed the apn (ATT Go Phone) from pta to nxtgenphone.
Turned on cellular data.
Finally had H+ above he signal bar, but had an X inside the bar.
Don't know if he did anything on his end, but the X went away after a couple of minutes.
Data was working, albeit kinda slow.
Turned off phone for three minutes per ATT rep.
Rebooted.
Data still slow, but it is at least working. Thinking I need to flash different modem. Battery usage has been higher the last day or two since I flashed c7 anyways.
Click to expand...
Click to collapse
---------- Post added at 04:38 AM ---------- Previous post was at 03:52 AM ----------
Another related problem and solution.
Whenever I switched on WiFi mobile data would turn off. Then when WiFi disconnects, Mobile Data never came back. Turning it back required turning on & off Airplane Mode or restart.
What fixed it:
- Go to developer option and select "mobile data always active"
- I also selected "Aggressive Wi-Fi to Cellular handover". Don't know if this option helps with this problem but I have it on (remnant of trial & error).
(I know it's an old thread but recording it here so that someone else benefits as I did.)
anujprateek said:
I installed (and reinstalled) LineageOS on my Note 3 and nothing could fix mobile data. This post saved the day.
I had to do one more change:
APN type -> default,mms,supl,hipri
Detailed settings are available at https://www.att.com/esupport/article.html#!/wireless/KM1218306?gsi=6Bft054
Click to expand...
Click to collapse

Cell service won't connect when roaming with Lineage OS on Sprint, works with stock

This is a Galaxy S5 on the Sprint Network with Lineage OS version from a few weeks ago.
Last week this was working fine and then since Sunday cell service stopped working completely. The only change I did was updating TWRP, I did not update LineageOS, but I can't imagine TWRP would have affected it. I ended up reverting back to the stock ROM thinking I would have to call Srpint customer service, but then it started working under the stock ROM. Reflashed TWRP and Lineage OS and no service. Tried older and newest versions of TWRP and Lineage OS but nothing works except stock ROM (yuck).
The cellular connection says "no service" with completely empty bars. About every 5 seconds it will flash like it is connected, with most bars and the little R for roaming, then immediately goes back to "no service". I've tried changing preferred networks and looked at settings but can't find anything to fix it.
Any ideas? It's almost like the network is rejecting it but I don't see why it would matter if it is a custom ROM.
EDIT: oh yeah and on start up it says "Activating cellular service... This may take up to 5 minutes" or and then after a while says "Couldn't Activate" and that it may be fixed by restarting the phone (which of course doesn't fix it). Also I'm not entirely sure if it is related to roaming or not.
EDIT2: I'm wondering/betting this has something to do with the ICCID number. I noticed with Lineage OS installed it says "DUMMY_NV_ICC_SERIAL" but with the stock ROM it is a long string of digits. Now maybe I can change the ICCID on Lineage OS? Or maybe Lineage OS isn't reading my sim card properly (from googling what ICCID is)?

I'm having similar issues trying to use this phone on FreedomPop. It looks like the cell services sometimes continually crashes/restarts - a reboot usually clears that up. I also get no LTE data (3G works fine). I have the correct APN AFAIK (https://support.freedompop.com/app/answers/detail/a_id/3322/~/apn-settings---lte-sim). Possibly related to the "DUMMY_NV_ICC_SERIAL" issue?

I've been experiencing this issue for a few weeks now. My LTE data is functional but I cannot send SMS while using 4G. The activation screen pops up when I restart my phone, and it will only activate under Sprint 3G service. I also have the same issue with the flashing service bars, every couple of seconds -- the only way I've found to remedy the lack of service is to turn roaming on and off -- after so many tries, the prompt to select my sim card pops up and it finally connects to the sprint network.

I dont know why this has worked for me but its been a struggle and a wicked pita for me. I use Tello as a provider which is a sprint mvno. This last time to get cell signal i had to flash a stock rom via odin doing a full factory wipe to the phone. I booted into the stock rom to make sure i had lte connectivity. Then booted to download, flashed twrp via odin. Booted into twrp. installed remastered remix 5.7? The next to latest ( marshmello version not neuget ) then booted into RR. Once there i switched it from global to LTE and added the tello apn. I can not connect but i have no idea why this worked. I would love it if someone could tell me why this worked and what i can do in the future to save myself some headaches, flashing factory rom every time i want to change a rom sucks.