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[Q] CM7 (build 93) - 3G radio issues???

Ok. So I ran into a serious issue and it most likely has something to do with the 3G radio.
Here's what happened. Phone was down to about 15% batteries after some Youtube and Angry birds. I was at my folks place and the cell signal there is not as strong, but still a bar showing. I noticed the phone was quite warm, but thought nothing of it since I was using Youtube/Angry birds. Check a few emails and noticed the batters quickly dropping to 12% within a few minutes and noticed Battery Status Monitor was reporting 990mA draw. I was alarmed, but didn't think too much about it and went to have dinner with the folks.
about 30/40 min later after dinner. The battery was dead. Didn't have my charger with me, so I didn't plug in for another couple of hours until I got home. Plugged in, booted up, everything was fine, except it would not connect to cell service stating "No Service". I then tried a bunch of things, rebooting, swapping out the battery, swapping out the SIM, but no avail. Swapping the same SIM to my old HTC works fine and connects on AWS 3G network.
This morning I tried another SIM that not on AWS, and it connects (assuming on 2G/EDGE network). Swap back in my original SIM and back to "No Service" (my provider only has 3G AWS service).
So at this point, I'm pretty convinced I have a hardware problem so I restore the stock Froyo ROM to return my phone...then magically, I'm back alive on the 3G AWS network!
Someone tell me what's going on!
I haven't tried to reflash CM7 again. Quite frankly I'm quite scared this may not be hardware problem and maybe a software issue instead, and may be stressing the 3G radio.
Help!

First, not to be rude, but this isn't development.
Secondly, what carrier are you using that only has 3G service and nothing else?
To me it sounds like your SIM card could just be shot, especially if you were able to insert another and it worked just fine.
Then again, that's hard to determine if your carrier actually only offers 3G service.

wrong section and a hard reboot always works ! volume up and power down hold for 10 seconds until u see lg

davehasninjas said:
First, not to be rude, but this isn't development.
Secondly, what carrier are you using that only has 3G service and nothing else?
To me it sounds like your SIM card could just be shot, especially if you were able to insert another and it worked just fine.
Then again, that's hard to determine if your carrier actually only offers 3G service.
Click to expand...
Click to collapse
How do I move this thread?
My original SIM is fine. It works fine on my HTC in 3G. The other SIM is with another carrier that's NOT on AWS spectrum and my G2X connected in 2G only. I'm in Canada, our new carriers Wind, Mobilicity, Public, etc are on 3G+ AWS only with no 2G fallback. I can restore my CM7 and try a hard reset if it doesn't come up. But I'm just concern, there's a software issue that cause this failure.

smoothmoose said:
How do I move this thread?
My original SIM is fine. It works fine on my HTC in 3G. The other SIM is with another carrier that's NOT on AWS spectrum and my G2X connected in 2G only. I'm in Canada, our new carriers Wind, Mobilicity, Public, etc are on 3G+ AWS only with no 2G fallback. I can restore my CM7 and try a hard reset if it doesn't come up. But I'm just concern, there's a software issue that cause this failure.
Click to expand...
Click to collapse
I had just flashed the newest CM7 Nightly and noticed when I woke up in the morning, my SIM wasn't being read. I wiped, re-flahsed, no workie. I tried a hard reboot, nothing. I even flashed to build 90 and still didn't read my SIM.
I'm loading xhoarder's tweaked GB right now...and it STILL isn't reading my SIM!!! What the hell happened?

mmorabe said:
I had just flashed the newest CM7 Nightly and noticed when I woke up in the morning, my SIM wasn't being read. I wiped, re-flahsed, no workie. I tried a hard reboot, nothing. I even flashed to build 90 and still didn't read my SIM.
I'm loading xhoarder's tweaked GB right now...and it STILL isn't reading my SIM!!! What the hell happened?
Click to expand...
Click to collapse
Mine stopped working after a couple of days. I'm back on stock Froyo and it's working again. Did it work at all for you with the latest CM7 nightly?

smoothmoose said:
Mine stopped working after a couple of days. I'm back on stock Froyo and it's working again. Did it work at all for you with the latest CM7 nightly?
Click to expand...
Click to collapse
It worked while I set everything up and loaded my apps. Went to bed, and when I woke up, the SIM wasn't detected. I'm on xhoarder's tweaked GB ROM and my SIM still isn't working.
Going to try a hard reboot.

Whythis is here?. There is a Q&A forum exclusively for questions.
Thread closed.

3G/UTMS not working - Could it be hardware?

Hi,
I have a Samsung Nexus S on Orange UK. I have noticed recently that I am not connecting on 3G and only GPRS.
I thought it may have been down to the ROM so I restored the stock firmware but that still doesn't work. Going to the testing menu (*#*#3646#*#*) confirms its on GPRS and if I set it to WCDMA Only, it attempts to connect and then says disconnected.
I have checked the SIM in a USB Dongle and it works fine so I don't think its reception or sim card related.
Is there any way to debug this on the phone? Could it be hardware (does GPRS use the same hardware or are they seperate radio chips).
Tom

Did you try to use a different radio? Sometime it is radio problem.
Accidentally sent from my Google Nexus S using XDA Premium

I bought mine on contract through cpw in December on a vodafone contract but not branded and it's unlocked and have no issues regarding this. All gsm phones are compatible with the UK networks (I think) so probably not a hardware problem. U should try another network Sim in your phone and see how that behaves.
If u don't get 3g then contact orange maybe it's their fault. Or could be you're not in a 3g area.
Sent from my Nexus S

Thanks for the replies.
The phone used to work on 3G - The SIM has not changed and putting the SIM in a Data dongle confirms its working so not a network issue or reception.
I have tried various radios just in case it was that, but again still no 3G.
I have tried everything I can think of which is why I was thinking it was possibly a hardware fault with the phone?
Mine was through CPW unlocked, which radio are you using leerobson99?

Xxkf1 just updated to 2.3.6 today, stock unrooted.
Sent from my Nexus S

To fbnts
Try a hard reset this may work for you.
Sent from my Nexus S using XDA App

sprint has been having a lot of issues with there 3g lately. mine has been intermitten the past few days and finally came back today
Edit: just realized you aren't on sprint.
still could be your service provider though rather than the actual phone.

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] 4g data drops often...too often

i have to reboot in order for the 4g data to work again but it only stays on for about a minute and then it stops working again. everything else on the phone works ( text, voice, wifi etc...) I read somewhere that flashing different radios might fix it but im not sure about that. anyone else experience this and have a work around? i am currently on baseband i535VRLG1
Thanks In advance
i called Verizon and they said it may be the sim card thats damaged. if that were the case wouldnt voice and text fail as well?

frunas80 said:
i have to reboot in order for the 4g data to work again but it only stays on for about a minute and then it stops working again. everything else on the phone works ( text, voice, wifi etc...) I read somewhere that flashing different radios might fix it but im not sure about that. anyone else experience this and have a work around? i am currently on baseband i535VRLG1
Thanks In advance
i called Verizon and they said it may be the sim card thats damaged. if that were the case wouldnt voice and text fail as well?
Click to expand...
Click to collapse
I'm having the same issues recently. I've always gotten a 4G signal at my house (albeit not the strongest one) but lately, my phone will not hold on to the connection. When coming off of wifi, my phone will not acquire a data connection at all most of the time. I can still send/receive texts and calls but there is no 4G or 3G icon, no MMS, and no data. I have to toggle the radios on/off, or change from CDMA/LTE to Global (or GSM) and back, put in airplane mode, or restart.....there is no guarantee any one of those steps will work. Sometimes I have to do it repeatedly until I get my data connection back but it is only temporary.
I'm on the i535VRBMF1 baseband and updated to the ML1 modem to try and resolve but to no avail. I have replaced my sim card (as I initially though that was the issue) but it has not helped either.
The only thing I can think of is that my PRL may have been updated (it is currently 15310) and it's causing issues with the towers in my area.
I just got back from Hawaii and was also in San Diego for a few days and had absolutely no issues. It seems to only be an issue now when I'm at my house which makes me think it is something VZW network related and nothing to do with my phone per say. It's really driving me nuts though.
BTW, I'm in Southern California (Irvine).

I seemed to have fixed the issue by reverting the baseband back to vrlf2. I had to switch from global to 4g/LTE because I vegan to inch roaming charges lol. Verizon credited me and no dropped 4g signal. So I'm happy.

frunas80 said:
I seemed to have fixed the issue by reverting the baseband back to vrlf2. I had to switch from global to 4g/LTE because I vegan to inch roaming charges lol. Verizon credited me and no dropped 4g signal. So I'm happy.
Click to expand...
Click to collapse
What ROM are you running? I'm just curious what the implications are of running an older baseband (from the ICS days) on a newer ROM/Kernel.

I'm running cleanrom8.1 core edition. Slightly buggy but tolerable.

I was finally able to somewhat resolve my issue so I thought I'd post in case anyone else is experiencing something similar.
By using a few different apps and testing techniques, I was finally able to deduce that my issue had to do with EHRDP hand-off with the towers in the immediate vinicity to my house. I'm not sure what VZW did to them lately but it doesn't appear to be a problem in other locations so it seems like the issue is on their end (and not something to do with my phone).
In any case, it seems that when my 4G connection is weak and EHRDP is detected, it is dropping the connection entirely instead of handing if off to 3G (EVDO). The connection is also never transferred back when a 4G signal is detected either until I reset the connection where there is a moderate 4G signal.
Again, this only seems to be an issue when connected to the towers near my house and doesn't occur when traveling abroad.
To fix this, I have disabled EHRDP by doing the following:
1) Open the dialer and type *#97328640#
2) Select "[2] CDMA"
3) Select "[2] Data"
4) Select "[7] eHRPD e/disable"
5) Select "[2] Disable(*)"
6) Reboot the phone
Now my phone switches between EVDO revA. for 3G (using the native protocols) and LTE rather than relying on the broken eHRDP protocols. This workaround will have to suffice until VZW fixes stuff in my area but at least I don't miss MMS messages anymore.
Hope this helps anyone running into similar situations.

BAFFLED: no LTE, tried everything

(well, everything short of new SIM card)
The situation:
-bought a 32GB N5 from a guy
-I'm on Rogers in Canada
-on Lollipop
-cannot get LTE, only 3G and 4G (H)
-APN is correct
-checked everything in *#*#4636#*#*
-cleared cache
-reflashed facotry image
-tried Cataclysm
SOMETIMES, I'll get "LTE", but it's a phantom - there actually isn't a connection at all.
I've swapped phones many times before; never had an issue. I read in threads someone saying that on AT&T that you need to register IMEI with them to get new device working with LTE. I never had to before, but called Rogers to check if this is something they've started doing.....no.
Under device model, it doesn't say either 820 or 821. It says "Nexus 5"
I started thinking that I stupidly bought the international model off the guy, but then when i was in fastboot mode I saw that it did say 820.
So.............I'm stumped, puzzled and pissed.
Does anyone, ANYONE have suggestions or ideas? Many thanks!

Sanity check but worth investigating:
- Definitely have LTE coverage in your area? I assume other phones around you connect to same LTE network no problem
- Does the SIM connect to LTE in another known working phone?

eddiehk6 said:
Sanity check but worth investigating:
- Definitely have LTE coverage in your area? I assume other phones around you connect to same LTE network no problem
- Does the SIM connect to LTE in another known working phone?
Click to expand...
Click to collapse
Yep, coming from my old phone. Have always had coverage in all the areas I've been with this new phone. LTE SIM, LTE area...it SHOULD work, but is not.

Try a new sim at the store, if it doesn't work return it on the spot. No harm, worth a try

Does 3g work? What bands does your carrier run in your area? You might try the diag LTE screen (requires root, there's an app from the Play Store) and see what band it sees. Also have you tried doing a scan of which carriers are available?

MrObvious said:
Does 3g work? What bands does your carrier run in your area? You might try the diag LTE screen (requires root, there's an app from the Play Store) and see what band it sees. Also have you tried doing a scan of which carriers are available?
Click to expand...
Click to collapse
3G and 4G work.
I went to Rogers store and got a new SIM. No change.

Same thing...
I'm just posting to let you know I've had EXACTLY the same problem..
Mine occurred after I smashed the screen and sent it away to a company to be repaired. My N5 came back with a new screen, so immediately I upgraded to lollipop...
Then the LTE stopped working. Occasionally the device would say it was connected to 4G but, like you, it didn't work when it showed this. I tried everything, flashing, checking access points, flashing different radios...but nothing worked.
Now I can't work out if the repair company had somehow damaged the 4G antenna when they were fixing the screen. So I sent it back to be repaired (again)
Now i've got it back. 4G works but it has lost a lot of speed. Where I was getting 25mb/sec on average, I now get 10 max.
I've e-mailed the repair centre to find out what they did, but honestly, I've given up a bit now...

Wait, you upgraded to Lollipop? You realize that they included a new radio right? Try reverting modems.
Sent from my Nexus 5 using XDA Free mobile app