Database Users

No Mobile Data on AT&T

I've had this problem for a while now but it's starting to get extremely annoying. If I'm not connected to WiFi I will have no mobile data at all. I can still send texts or make a phone call but I can't go on the internet or receive MMS. I've tried at least 5 different APN settings and I've made sure that "Data Enabled" is checked but nothing works. When I contacted AT&T they said there is nothing they can do because it is not an AT&T device.

BeastKiller450 said:
I've had this problem for a while now but it's starting to get extremely annoying. If I'm not connected to WiFi I will have no mobile data at all. I can still send texts or make a phone call but I can't go on the internet or receive MMS. I've tried at least 5 different APN settings and I've made sure that "Data Enabled" is checked but nothing works. When I contacted AT&T they said there is nothing they can do because it is not an AT&T device.
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Maybe you should try again, but this time tell them you'll drop them like a hot potato if they don't give you the correct APN settings. They're doing false advertising by telling you just because it's not their device that they cannot help you. Oh really jerks? I'd ask them why the f you pay full price like everyone else then. Try playing rough, maybe you'll get a response. I'd answer you but I don't know AT&T's settings. I use T-Mobile.
After some research, it may be a problem on their end. They may have you set up for a non-smartphone data plan or HSPA or LTE, not HSPA+ data. Look at your statement and see what plan you're on. You can always call them and make sure you're set up with HSPA+. Tell them to die in a ditch if they refuse to service a paying customer. Try reading this: http://forums.androidcentral.com/google-nexus-4/226814-anyone-activated-nexus-4-att.html

BeastKiller450 said:
I've had this problem for a while now but it's starting to get extremely annoying. If I'm not connected to WiFi I will have no mobile data at all. I can still send texts or make a phone call but I can't go on the internet or receive MMS. I've tried at least 5 different APN settings and I've made sure that "Data Enabled" is checked but nothing works. When I contacted AT&T they said there is nothing they can do because it is not an AT&T device.
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I'm having a similar issue that seems to have started around 4-5 days ago. I'm in the Twin Cities area, btw, if that matters.
Prior to that, I was only the victim of the occasional data drop or ARP offload delayed-notification issue.
The problem usually, but not aways, occurs when I leave a WIFI area and get handed off to the cell towers. I get no data, but calls/SMS works fine. Anywhere from 5-15 minutes later, I will get mobile data again, but only briefly before it goes away again.
The issue can also occur when seemingly changing towers, or going from HSPA > HSPA+.
On occasion, when the problem is occuring, my cell bars will still show blue as google services don't know they've been disconnected, but when I attempt to access, for instance, gmail or GNow, I will get no connection. Finally the bars will turn grey as the phone attempts to (apparently) cycle the radio.
Oddly, I stopped into a retail store here locally and the gal said they were having data issues so I figured it'd be fixed. That was 5 days ago. 3 days ago I called customer care and logged a case. They've found no issues with their towers or my provisioning thus far.
I also switched out my SIM card. No change.
At this point I think I'm going to walk over to T-Mobile and try a prepaid SIM to see if it's the phone or really and truly something with AT&T's network.
I'll post a logcat here if anyone is interested but I couldn't find too much interesting within it.

dispatch said:
I'm having a similar issue that seems to have started around 4-5 days ago. I'm in the Twin Cities area, btw, if that matters.
Prior to that, I was only the victim of the occasional data drop or ARP offload delayed-notification issue.
The problem usually, but not aways, occurs when I leave a WIFI area and get handed off to the cell towers. I get no data, but calls/SMS works fine. Anywhere from 5-15 minutes later, I will get mobile data again, but only briefly before it goes away again.
The issue can also occur when seemingly changing towers, or going from HSPA > HSPA+.
On occasion, when the problem is occuring, my cell bars will still show blue as google services don't know they've been disconnected, but when I attempt to access, for instance, gmail or GNow, I will get no connection. Finally the bars will turn grey as the phone attempts to (apparently) cycle the radio.
Oddly, I stopped into a retail store here locally and the gal said they were having data issues so I figured it'd be fixed. That was 5 days ago. 3 days ago I called customer care and logged a case. They've found no issues with their towers or my provisioning thus far.
I also switched out my SIM card. No change.
At this point I think I'm going to walk over to T-Mobile and try a prepaid SIM to see if it's the phone or really and truly something with AT&T's network.
I'll post a logcat here if anyone is interested but I couldn't find too much interesting within it.
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I've been on the T-Mobile network now for about an hour and I have had ZERO of the aforementioned issues. The phone definitely handles leaving WIFI > HSPA better as well.

Roaming on VZW after CM13

When I first started using CM13 my signal went to roaming when I know I should have service. I have data roaming off and I've checked to make sure I'm not getting charged for roaming and I'm not. My phone works as it should and I can do everything I need still so I was hoping it would be fixed in one of the new updates. I am on the newest nightly build as of this morning and the R above my signal is still there, just wondering if anyone else is having this problem or know the cause?

I have the same issue on my Nexus 6

Same issue here. Nexus 6 Verizon, just switched to CM13 and I'm stuck on roaming - so far I've tried airplane mode for a minute or two, turning the data off and on, turning the phone off and on, and chatting with Verizon support in case they could do anything remotely. The one thing I haven't done though is try putting another sim card into my phone to see if I could divine any information that way.
Any help would be appreciated.

So after trying just about everything I decided to cave in and jump back to CM12. It was there that I noticed a key difference:
CM12's settings -> mobile network settings, has the following sub-options:
Data Roaming on/off
Preferred Network Type
Enhanced 4G LTE Mode on/off
System select
Access Point Names
CM13 (nightly #2) only has:
Data Roaming
Preferred Network Type
System Select
...while in all honesty I don't know what it all means except to say that it appears to be missing some features of the CM12 nightly I'm using on my Nexus 6 on Verizon. I guess I'll try back in a week or three to see if everything is working fine.

For whatever reason I had LTE pop up for like 2 seconds but went back to R and has stayed since..

LTE after loosing signal takes for ever

Every time if by some reason I loose signal (using and elevator, going in an underground parking, etc) it takes a very long time to get it back. Sometimes several minutes which is really annoying. Most times it set on E, then I have to go to airplane mode of other tricks in order to get it to LTE or H+. I've already change Sim card. Any ideas?
Enviado desde mi SM-T810 mediante Tapatalk

It's a bug, till google fixes it, use the airplane mode switch.

Also have the same problem on Verizon in the US.

Yep I just always toggle Airplane Mode in this situation.

Does the same for Sprint.

I don't lose signal. I do somehow switch to 3g from LTE but from what I've read that's a mmb29q mm bug. Never taken me several minutes to do anything on my device. Only thing I do notice is sometimes I get on 3g and I can get back LTE if i update my prl (I'm on Sprint) and reboot. This is a mm bug not carrier spacific from all I've read.
Sent from my Nexus 6P using Tapatalk

This has happened since eclair, if not earlier, and seems to be inconsistent over networks and devices. I've found it happen most often in places with overlapping cell towers with poor signal quality.
However, if you enable developer settings there are toggles for aggressive handover and maintaining mobile data with WiFi that may help to alleviate your issue.

Ok, so I switched to Cricket a while back from Verizon. I didn't notice the data drops on Verizon. But every aosp rom I've run has had some jank to some extent. Cm13 gives me the best connectivity, period, as far as wifi and data, speeds, etc. My favorite rom is screwd. It's the worst for me with lte and wifi drops. My phone won't stay on either one for an extended period of time and doesn't handoff to lte very well. What I've noticed, after reboot, is that aosp roms aren't selecting your APN and you have to manually hit that. Then sometimes, for me anyways, I have switch to 2g (the switch where the lte preferred is) then switch back to lte preferred. And that switch brings back lte faster than anything for me. Cm 13 is flawless though. It works like it should.
Sent from my Nexus 6P using Tapatalk

Ok , so did you all see post # 237 from Jason J in this thread: https://code.google.com/p/android/issues/detail?id=197102#c273 ?
Its been a week of continuous LTE. Running 6.0.1 build MMB29M from the factory. did not do any updates. no issues.
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I'm going to try this. I'm presently running with sytsemless root. Is it possible to load this without having to completely wipe the phone?

https://productforums.google.com/forum/#!topic/nexus/T5Awh6VqsG4;context-place=forum/nexus People need to sign this , get some attention on this

All of a sudden I've lost 4G reception! HELP!!

Hi All,
First time poster with an unusual problem. I live in Australia and have a Samsung Galaxy S5 SM-G900F which is the European model. Up and till recently I was getting Telstra 4G reception. Now all of a sudden I'm only getting constant 3G reception. I have confirmed that there are no 4G network repair/maintenance/upgrade issues in my area. It was only in the last week that I noticed the constant 3G reception so I can't really pinpoint a specific incident or exact date as to when it actually started happening. Here is what I have tried thus far:
Phone restarts, changing network settings and switching to flight mode.
I've confirmed that the phone network is set to LTE/WCDMA/GSM (auto connect).
I have done numerous hard resets, cache wipes, Dalvik cache wipes, drive wipes, etc.
I have rooted and unrooted the phone numerous times.
I have tried several different stock and custom ROMS.
I have tried 4G SIM cards from other phones.
Tried numerous network switching apps.
NOTHING WORKS!
I always love to tinker with my phone so I'm always looking for ways to improve the phone's performance. It may be that an app (battery improvement/tweaking type apps) I installed somehow changed the network settings but I would have thought a million hard resets would have sorted that all out but apparently not. At the moment I'm running a rooted stock Android 5.1 ROM. I've tried stock Android 4 and 6 as well with no joy.
Here is the unusual thing. When I put in another 4G SIM card into my phone the network still remains on 3G but as soon as I put my SIM card back in 4G magically reappears. It's bizarre. At least I know my phone can still get 4G. You would think that would solve the problem but it doesn't. When I am in an area where the 4G signal is weak the stronger 3G signal kicks in as it is supposed to. When I get back into an area with strong 4G reception the phone remains stuck on 3G and no matter what I do it won't go back to 4G unless I go through the convoluted process described above.
I am all out of ideas. I think I have tried everything possible. I've trawled the web and I appear to be the only person in the world with this problem. I don't know if it is a software or hardware problem with my phone. My SIM card works in other 4G phones so I don't think it is part of the problem. At the end of the day it's not a big deal as 3G is fine but I'm just one of these people that has to fix a problem. Worst case scenario I'll probably upgrade the phone in the next 6 months.
Any suggestions or tips other than what I have listed above would be greatly appreciated. Thanks in advance.
Bulky

Moto X Pure (XT1575) drops connections and data

Okay, so I really like my Moto X Pure. I used it in Florida with no problem with network or data or text or anything. The instant I left Florida my data dropped (couldn't load anything anywhere), I would get 1 text every 5 minutes, and phone calls couldn't be completed.
If I run speed test it'll take about a minute to find a server, my ping will be 500+, and my speed might get up to 0.9MBps for a split second, then drop to zero for a few seconds, then a spike of 0.9 again, etc.
I can watch the network bars go from full, to nothing, to full, to nothing, to 1 bar, switching from LTE, to H+, to 3G, to 2G, and all back over again. On every ROM, with every carrier, rooted, unrooted, stock, modified, updated radio, OTA radio, everything.
I've tried EVERYTHING
Revert back to completely stock (was running CM13.1)
Tried other ROMs
updated radio/modem
downgraded to 5.1
SWITCHED CARRIERS from Verizon to AT&T, tried T-Mobile sims....
EVERYTHING gives me the same issue! If I plop the sim cars into my nexus 6 or my G3 then I get connectivity and speeds no problem.
Unfortunately since I have unlocked the bootloader, I don't believe I can get warranty on this phone.....
But why would it work PERFECT in Florida, but nowhere else in the entire United States? I mean, NOWHERE. I did an across the country road trip.

Yep same here
Sent from my XT1575 using XDA-Developers mobile app

Huhuhu I guess it's time to sell.
I got the G5 and didn't care for it. I think I'm actually just going to get a G4.

I'm in the same boat. It seems my LTE speeds are fairly good here in Canada on Rogers. Sometimes I get decent 3G speeds but mostly it just fails entirely. Completely stock. No problems with SIM on other devices. Phone is 2 months old but it's been doing this since the beginning.