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[Completed] Signal Loss

I've been searching high and low for a fix to my occasional data loss problem. When signal is lost (0 bars) sometimes it won't come back until I restart the phone or put it in and out of airplane mode.
My problem started when I upgraded to Virgin Rom GPE 4.4.4. While on 4.3 everything worked fine. But now when I revert back to 4.3 I'm faced with the same signal loss issue. I flashed the modem from http://forum.xda-developers.com/show....php?t=2544612 and still no luck.
I've also flashed Danvdh version of GPE 4.4.4 and I face the same issue.
Any help would be appreciated.

Please specify your Device as well as Carrier so we may be able to help you in the right direction. the Thread you have linked does not go anywhere.

[Q] No Signal - Modem Broken?

Problem Solved - I restored the CM12 backup and now I have signal. Do you folks think I will continue to have problems if I attempt to go back to KK again?
After trying the CM12 Nightlies, I decided i wasn't a fan and decided to try some KitKat AOSP Roms before going back to CM11. My first mistake was installing the AOKP Rom which wasn't officially supported for the Sprint version. During set up I realized that there was no cell data and tried to unroot. My second mistake was when I got cell signal back; I decided to test if the initial loss of signal was just a fluke. Re rooted and reflased the same AOKP rom. Once again i lost cell signal. However, when I unrooted to stock this time there was no cell signal on the stock rom. I have no idea how to fix it. I've tried to flash the .pit i saw in another post and tried to use the "Phone EFS Clear" in Odin to no avail. At this point I'm rooted with a the Stock ROM and no cell signal. I realize I got myself into this mess by being dumb but I could really use the help in fixing the issue.
Info - Rooted with TWRP Recovery running Out of Box Stock Rom.

APN fix!
This will fix signal issues!

Thanks, if I go back to a KK ROM and have the same issue I'll have to try it out.

(Resolved) opo hard-bricked, recovered and now has problem getting cellular signal

Hi guys,
Tried to flash OxygenOS 1.03 through twrp 2.8.7 after getting some annoying problems with OPO on the latest CM11s.
Done many flashes before so didn't really expect much problems. Then OPO couldn't boot up at all with black screen. I followed the instruction here to unbricked with factory tool to clash an old edition of ColorOS and I thought that was the end of it. Flash OxygenOS again, bricked again.
Then I recovered and flashed COS 12.1. Didn't really want to make the jump but I had too. I immediately noticed I am unable to connect to 4G. Thinking that the OS 1.03 from OP didn't contain any modem update and thus the hard brick, I flashed 1.03 again and worked. Again no 4G or any cellular connection. I went out side and finally got a very weak 4G connection (I usually have full bar around my home). Really desperate, I flashed back to official CM12s, and flashed the correct radio for it. Same thing.
It has been a week now. I could get some connection if force it to 3G but still very spotty. It is hard to use. I tried different modems, even one from ColorOS because I am in China and I got the phone in US.
Any tips on solving this?

I fixed it by reflash raido of xnph52q found here. The zip contains more than the radio firmware.
http://forum.xda-developers.com/oneplus-one/development/rom-stock-rooted-xnph52q-t3025399
I flashed it before but it didn't work. The only difference is I used TWRP 2.8.6. I remember reading somewhere online that 2.8.7 has issue with OPO.
I will changed it to resolved and save it as reference for others

My One won't reconnect to network after it looses signal

Hi there,
Everything was working just fine, but since I switched to a new carrier I can't get the network back as soon as my OP looses it (subway for example). I have 4G as my favorite internet mode and my APNs are good.
Only a full reboot fixes it, not even a soft one. What can I do?
I use the lastest CM 12.1 S rom (YOG4PAS3JL)
Maybe I should try to flash Oxygen's modem? http://forum.xda-developers.com/one...dio-updated-modem-radio-files-oxygen-t3072516
It seems many users are affected by the problem but I didn't find a real solution, hence my post.
Thank you!

After a long investigation, it seems that the OPO is having trouble switching for and from 4G. I solved it using 3G as my preferred network, but I'd have loved using 4G

reinstall the system... u can google fastboot images for opo... flash them through CMD

I've tried 3 ROMS and at least 4 modems so I think I've tried eveything that's available atm

I have had the same problem for some time now. But no reliable solutions found. Have tried various versions of ROM and Radio. Currently using 44S and CM 12.1 S (YOG4PAS3JL).
Lamner said:
Hi there,
Everything was working just fine, but since I switched to a new carrier I can't get the network back as soon as my OP looses it (subway for example). I have 4G as my favorite internet mode and my APNs are good.
Only a full reboot fixes it, not even a soft one. What can I do?
I use the lastest CM 12.1 S rom (YOG4PAS3JL)
Maybe I should try to flash Oxygen's modem? http://forum.xda-developers.com/one...dio-updated-modem-radio-files-oxygen-t3072516
It seems many users are affected by the problem but I didn't find a real solution, hence my post.
Thank you!
Click to expand...
Click to collapse

kingalpha said:
I have had the same problem for some time now. But no reliable solutions found. Have tried various versions of ROM and Radio. Currently using 44S and CM 12.1 S (YOG4PAS3JL).
Click to expand...
Click to collapse
For how long have you been using that? Did that fix the problem?
This is very annoying!!!!

xupi said:
For how long have you been using that? Did that fix the problem?
This is very annoying!!!!
Click to expand...
Click to collapse
Didn't fix the problem. Finally reverted back to Oxygen OS. Complete reinstall, including bootloader, storage, everything. Got it done at OPO service centre. Much better reception now.

Do I need to flash anything other than just the ROM?

I recently rooted and flashed Sultan's MM ROM. I began to have network issues and this morning I saw No SIM Card error. Rebooting fixes it for a while, before it returns. I also see that the signal indicator drops to no bars a lot (used to have this on Lollipop too). I tried resetting APN settings. That didn't help much.
I flashed using TWRP 3.0.1. Could that be an issue? I see many threads saying that 2.8.6 was stable.
In this thread, the person said they had flashed CM Snapshot to address a similar error. Is that something I have to do? If so where can I find it? I am on TMo USA.
Or is there another fix?

Have you flashed latest modem?
http://blazingphoenix.in/mzo/ONE/Modems/