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Repeatedly Losing Data Connectivity

My Nexus 5 frequently loses mobile data connectivity. Its been happening since I purchased it, but the frequency with which it happens has increased since I flashed the M1 snapshot of CM. I've since flashed the second snapshot from early January, but it has not made any difference.
This is the same sim card that ive used with my nexus 4 and my htc one without any problems, and I've made no changes in my wireless carrier.
Does anyone have any thoughts as to why this happens?

Try a different,maybe older, radio. If that doesn't help go back to stock and see if it persists.
sent from my Hammerhead Nexus

Flash the Nexus factory image. If that fixes it, its a problem on CM's side
Sent from my Nexus 5 using XDA Premium 4 mobile app

hi.
i was this problem too, not exaactly the same, but somehow similar. I have 3g connection, the signal bar shows H and somtimes 3G, but the speed is freaking slow, worse than 2g. Initially I thought its something wrong with my phone, been changing ROMS to see if it is the issue, but no. Then I flash the latest baseband / radio, and still doesnt help.
Be reminded I am on 4G plan, but never had any 4g network ( it is not because i'm not in an area with no 4g network )
I was very frustrated and emo at the same time, thinking of RMA the phone, thought it is the radio chip problem.
but then... I called my telco, asking why I'm experiencing slow connection and bla bla, and I don't have 4g network. They keep saying my network is working perfectly, and running normally, I requested them to reset my network connection. They agreed and asked me to turn off the phone for a few minutes then they reset the network for me.
After that, everything is running perfectly.
This was 2 days ago. And guess what, I don't have any 4g connections now again. Stupid telco, I'm going to call them later when i'm free. grrr.
but please make a call to your telco and ask them.
Hope that helps

[Q] Can't make or receive calls

Started a couple days ago, using straight talk AT&T sim on my nexus 5, Data and text messages work fine, but whenever I try and make a phone call the signal drops completely and calls won't connect. People been telling me when they try to call it goes straight to voicemail. I'm running stock rom. Any suggestions? Straight talk and Google both with no help.

Have you tried a different sim card from like a friends phone to make sure its not the phone itself? You can also try to call ATT to see if its on their end.
Sent from my Nexus 5 using XDA Premium 4 mobile app

Swapped sims with my wife. Mine worked on her phone hers didn't on mine. Think it might be a hardware issue on my phone and I got it on Craigslist so I think I'm screwed

Sounds like it definitely is a hardware issue now or something with the Sim tray. Sorry to break it to ya. Hopefully you can work something out with the guy on Craigslist.
Sent from my Nexus 5 using XDA Premium 4 mobile app

Thanks. I have had the phone for about 4 months with no issues. I K of its not the sim tray because I still get data and texts and I can receive calls sometimes if I have dull reception somewhere. It just started all of a sudden, pretty frustrating

I just the same issue today as you. It was a ROM issue. I was on PA. I switched to aokp for now.
Sent from my Nexus 5 using XDA Premium 4 mobile app

backside floaters said:
Started a couple days ago, using straight talk AT&T sim on my nexus 5, Data and text messages work fine, but whenever I try and make a phone call the signal drops completely and calls won't connect. People been telling me when they try to call it goes straight to voicemail. I'm running stock rom. Any suggestions? Straight talk and Google both with no help.
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Click to collapse
I had this issue on the stock, unrooted ROM after about 4 months as well. I think the cache partition was corrupted. You can try wiping this in recovery and see if the problem fixes itself.
I didn't think of just wiping the cache, so instead I did a factory reset by unlocking the bootloader and everything cleared up.
Now I wipe the cache partition roughly once a month and the phone runs like a champ. Also I use sdmaid to clear the device from junk that accumulates over time.
Sent from my Nexus 5 using Tapatalk

_jordan_ said:
I had this issue on the stock, unrooted ROM after about 4 months as well. I think the cache partition was corrupted. You can try wiping this in recovery and see if the problem fixes itself.
I didn't think of just wiping the cache, so instead I did a factory reset by unlocking the bootloader and everything cleared up.
Now I wipe the cache partition roughly once a month and the phone runs like a champ. Also I use sdmaid to clear the device from junk that accumulates over time.
Sent from my Nexus 5 using Tapatalk
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Thanks for the help, but I already did a factory reset with no success. Data works fine on LTE but if ibtryvswitching to 3g or 2g signal drops as well. If I have full signal it will connect but anything in less it doesn't connect the calls.

Flash factory images then.
Sent from my Nexus 5 using Tapatalk

This happened to me on my non rooted N5 with 4.4.4. Disabling Wifi and/or LTE sometimes allowed a single SMS to get through, but then the problem resumed.
I fixed it by booting into recovery and wiping the cache partition. For some reason that took a long time (about 5 minutes) but eventually it finished and when I rebooted it was all good.

I'd try the wiping the cache and reflashing the radio.
I had a similar issue first week of owning the phone any time I sent a text I lost service until I rebooted.
From what I've read some N5's don't like the 4.4.4 radios. Mine likes 4.4.4 but couldn't pick up a signal if it had a 50ft antenna with 4.4.3 radio.
Sent from my Nexus 5 using XDA Free mobile app

Nexus 5 Not making or receiving calls
backside floaters said:
Started a couple days ago, using straight talk AT&T sim on my nexus 5, Data and text messages work fine, but whenever I try and make a phone call the signal drops completely and calls won't connect. People been telling me when they try to call it goes straight to voicemail. I'm running stock rom. Any suggestions? Straight talk and Google both with no help.
Click to expand...
Click to collapse
I just had this almost exact same scenario. I started having problems with signal dropping using CM12 nightlies (late April 2015) then eventually I switched over to a NET10 because T mobile was not cutting it to begin with. After the problem persisted on an ATT Sim card with NET10, I started flashing different ROMs. Signal seemed to be more stable and everything was fine for a while. After a few days I was no longer able to make or receive calls.
Eventually I did a complete factory image (still didn't work)
Flashed a 4.4 radio image (didn't work immediately, but the next morning it seems to be working as of now)
I probably could have skipped the hours of trouble shooting if I would have (found this thread first) and just tried flashing different radio images. Or maybe it was the series of other steps combined...not really sure.
Good luck and hopefully this helps the next person going through this mess. Oh and don't event waste your time calling NET10/Straighttalk customer service.
*EDIT* Above did not solve my problem, I actually had to fix the physical radio connections which came loose.

same problem
Hey guys having the exact same issue. Dropped my phone hard and then all of a sudden I cannot make or receive ant calls with my carrier dialer. I can send and receive texts, use LTE data , Wi-Fi. When I place a call, it is silent for about 10 seconds then drops the call. When people call it is silent for 15 seconds, then voicemail.
Called google, said it is out of warranty and LG would have to repair it for $150 just to see the phone.
Have done a cache wipe and factory reset. Is this most likely a hardware issue that I need to open the back for ? Little bit of a tech noob but can work my way around things. Any help is super appreciated as I love my N5 32G and don't have the money.

Same issue that I had, just remove the back and reattach/secure the radio wiring. It's on the left side and rubs parallel to the battery. It was a petty quick and easy fix.
Sent from my Nexus 5 using XDA Free mobile app

kgtgv4 said:
Same issue that I had, just remove the back and reattach/secure the radio wiring. It's on the left side and rubs parallel to the battery. It was a petty quick and easy fix.
Sent from my Nexus 5 using XDA Free mobile app
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So I took the back off and looked at the cables and they were both connected. I took them off anyways and reconnected them. Didn't see anything surprising to my eyes at least. The only thing I did find out was that LTE is the only setting that I can't use data and texts on. 3G and 2G say no cellular network detected. Do I maybe need to replace the antenna cables ??

mac_attack10 said:
So I took the back off and looked at the cables and they were both connected. I took them off anyways and reconnected them. Didn't see anything surprising to my eyes at least. The only thing I did find out was that LTE is the only setting that I can't use data and texts on. 3G and 2G say no cellular network detected. Do I maybe need to replace the antenna cables ??
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Hmmm. I don't think the cables would be bad. I would just make absolute sure that they are staying attached after you re-assemble your phone. I even put a small piece of tape over the end that I noticed was loose. If that doesn't work then I think we had different issues with the same symptoms.

I'm having this same issue. Three weeks now, unable to make or receive calls. SMS and data work fine. Wifi works. LTE works. When I switch to 3G or 2G there is no connection and T-Mobile doesn't appear in the list of networks. The SIM card works fine in another phone so it must be an issue with the device.
Tried everything on the software and settings side, flashed different ROMs, flashed different radios including stock. No change whatsoever. I completely disassembled and reassembled the phone. Nothing was loose or looked broken, all contacts seem to be making contact.
I do vaguely recall dropping the phone recently, so I guess that must have been it. The only other possible cause was that Google Play Services was auto-updated the day before I noticed the problem. Of course that is unlikely to be the cause but just mentioning it in case anyone else had this issue starting around Oct 23, 2015.
As much as I hate to do it, I guess I'll have to get a new phone. Just no other solution I can see unfortunately.
For anyone finding this posting through Google, currently there is no VoLTE (Voice over LTE) support in the Nexus 5 on T-Mobile. If that is available when you're reading this, then you might look into enabling VoLTE and seeing if you can make voice calls using that. Based on my reading it seems like VoLTE is a software update (perhaps requiring the provider to support the device as well), but the consensus seems to be that VoLTE on Nexus 5 on T-Mobile is unlikely to happen. But they support it on the Nexus 6, so maybe there is some way it can be done on the Nexus 5. Also Wifi Calling on T-Mobile is not available for the Nexus 5. The consensus there is that the stock Google/T-Mobile ROMs are unlikely to ever add Wifi Calling support for the Nexus 5, but perhaps CM 13 or Android Marshmallow do or will have Wifi Calling support built in, so there may be some possibility of getting Wifi Calling using those.

Did you try checking the cell antenna? That was my issue, I just tapped it back in place and my N5 has been fine ever since.

kgtgv4 said:
Did you try checking the cell antenna? That was my issue, I just tapped it back in place and my N5 has been fine ever since.
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If you mean the ones with the long wires, then yes, I checked those. Actually I checked pretty much everything inside the phone. According to this excellent disassembly video: youtube dot com/watch?v=OPuCmfhzgbg , there are lots of antennas and antenna contacts. So many that he doesn't get to all of them until 20 minutes into the video. But still, I checked all of those and they looked ok. There must be some damage somewhere, just too small for me to spot. He also identifies "external test ports" for some of the antennas. I don't know how those are used or if they would be useful to debug this issue, but for anyone else experiencing this, you might try looking into those.

Help
backside floaters said:
Thanks. I have had the phone for about 4 months with no issues. I K of its not the sim tray because I still get data and texts and I can receive calls sometimes if I have dull reception somewhere. It just started all of a sudden, pretty frustrating
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Click to collapse
I'm having the same problem on my Nexus 6 and don't know what PA is and how to change it

No data in Carbon ROM.

I spent an hour on the phone with AT&T and couldn't resolve the issue of why I don't have data working.
Can anyone help me to figure out why I can't get data with this ROM?
Sent from my SGH-T699 using XDA Free mobile app

Being this phone has T-Mobile radio bands the first you need to do is unlock it, which if you have the ability to make phone calls I assume you did this or someone did for you
Also you will need proper APN set up, this should have been something you tried spending an hour on the phone with ATT. So that leads me to believe that there is an alternative APN setup that you need, just do a Google search and you will probably find a couple setups out there and try them all
Do note that you probably will get lower data speeds being this phone isn't working with the bands that ATT uses - but I'm a T-Mobile user so haven't specifically tried to get mine to work thus have no experience to help further
Sent from my Nexus 4 using XDA Premium 4 mobile app

demkantor said:
Being this phone has T-Mobile radio bands the first you need to do is unlock it, which if you have the ability to make phone calls I assume you did this or someone did for you
Also you will need proper APN set up, this should have been something you tried spending an hour on the phone with ATT. So that leads me to believe that there is an alternative APN setup that you need, just do a Google search and you will probably find a couple setups out there and try them all
Do note that you probably will get lower data speeds being this phone isn't working with the bands that ATT uses - but I'm a T-Mobile user so haven't specifically tried to get mine to work thus have no experience to help further
Sent from my Nexus 4 using XDA Premium 4 mobile app
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I forgot to mention that data was working fine with the stock ROM, both the one the phone came with and the OTA upgrade version.

I just installed CM 11 snapshot M8, and have the same issue of no data. Prior to installing (through TWRP 2.7.1.0), I did a factory reset, then wiped Dalvik Cache, System, Cache, and Data.
Why would would the stock ROM work but not these others?

Did you go into settings and change the APN in cm11 yet?
Sent from my Nexus 4 using XDA Premium 4 mobile app

demkantor said:
Did you go into settings and change the APN in cm11 yet?
Sent from my Nexus 4 using XDA Premium 4 mobile app
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That did it! I had to select ATT Phone. For whatever reason, ATT LTE doesn't seem compatible. I live in the hills, so have inconsistent coverage, but the indicator goes from 3G, to H, to H+, then back again, based on... wind, clouds, barometric pressure, or whatever the usual issues are. Anyway, I've been with AT&T since 05 and the only time I actually saw a noticeable increase in real-world speed was going from an EDGE device to a 3G device. 4G doesn't seem to be any faster, which I believe is due to backhaul issues, not connection speed of my phone to a tower.

3G problems on 5.0.1

Hello everybody,
I am using a Nexus 5 for a full year now and I noticed from the beginning that I never can get 3G signal, but when I am in the nearest city I van get 4G/LTE. Last week I wanted tot know more about it so I inserted my sim into another phone and immediately I had full 3G connection. So I updated to 5.1.0 with the new radio for 5.1.0 and I still couldn't get 3G. When I googled for 3g coverance I noticed I shoud've get full 3G. however only 2G and 4G works but the problem is that there is no 4G coverance in my hometown so I am stuck at the slow 2G. I'm in the netherlands and I already tried all options in *#*#4636*#*# but I still dont get 3G. also my apn settings are correct. so my last hope is to ask here if anyone knows what to do. I'll include a picture of my baseband version etc.
Sent from my Nexus 5 using XDA Free mobile app

If it doesn't work after clean flashing factory images and trying different radio versions, it might be a hardware problem.

It's sad because I don't have any warranty anymore because I've opened the device up to replace the screen myself. Do I need to change the whole motherboard?
Sent from my Nexus 5 using XDA Free mobile app

Major Data problems

Hi all, I am having major data problems with my phone. I am using Ting on the sprint CDMA/LTE network.
I am currently running CM12.1 nightlies but the problem existed on Android stock L and CM 12.
What happens is, after 5 min to several hours i lose data connectivity and end up with an exclamation point on the signal bar meter. When this happens the only way to fix it is to reboot the phone. I have tried to do a Carrier update and PRL update but both give network errors and fail. I also tried to type the *#DATA code but it doesnt work, it just deletes what I type in an nothing happens.
Also, even when my data is working (and it says LTE on the signal bars), my mobile network data slider in settings is always off and can not be turned on, no matter what.
I am on the 5.1 radio and even tried to reflash it. Any ideas?
Thanks

mike240se said:
Hi all, I am having major data problems with my phone. I am using Ting on the sprint CDMA/LTE network.
I am currently running CM12.1 nightlies but the problem existed on Android stock L and CM 12.
What happens is, after 5 min to several hours i lose data connectivity and end up with an exclamation point on the signal bar meter. When this happens the only way to fix it is to reboot the phone. I have tried to do a Carrier update and PRL update but both give network errors and fail. I also tried to type the *#DATA code but it doesnt work, it just deletes what I type in an nothing happens.
Also, even when my data is working (and it says LTE on the signal bars), my mobile network data slider in settings is always off and can not be turned on, no matter what.
I am on the 5.1 radio and even tried to reflash it. Any ideas?
Thanks
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https://productforums.google.com/forum/#!msg/nexus/o-UyGECxh2k/VIK3PFfFwG8J

Also experiment with Radios. Nexus 5 for me has been the worst for Radio reliability. The latest one for me gives the issues you describe. Its not the only one to do so either.
Sent from my Nexus 5 using XDA Free mobile app

zagorteney said:
https://productforums.google.com/forum/#!msg/nexus/o-UyGECxh2k/VIK3PFfFwG8J
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THANKS! Insane the nexus 5 has such a major issue and it hasnt been fixed!

grim00 said:
Also experiment with Radios. Nexus 5 for me has been the worst for Radio reliability. The latest one for me gives the issues you describe. Its not the only one to do so either.
Sent from my Nexus 5 using XDA Free mobile app
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Do you mean try the 5.0 radio on 5.1?

Radio 2.0.50.2.21 works best for me.
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