Database Info

[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.

Galaxy S7 LTE problem's

Hello from Bulgaria.Some one have had a problem with 4g network.Samsung S7 when he was lte \ 3g \ 2g after 30-40 minutes , scope disappears and receives a missed call notification.The problem gone after restart the device and after 30-40 minutes is same situation.If a phone is an 3g\2g no problems.
Sorry for my bad english.

Same here
My cousin bought an S7 Edge, but it had the same problems as listed. She then proceeded to change the phone, yet the other S7 Edge had the same problem. What could be the solution to this problem, and what caused it?

I change 3 phone 2 black and now give to me gold,for now i don't have a problem with the gold piece. Everything work fine.

Gachev said:
I change 3 phone 2 black and now give to me gold,for now i don't have a problem with the gold piece. Everything work fine.
Click to expand...
Click to collapse
We changed two gold ones, awaiting for the third. Problem seems to be persistent.

Hi!
Go to settings and find your APN-settings. Remove IPv6 and save it. Then everything should work fine.

I'm having the same problem. I'm sitting beside my friend with his ip6s+ and he's not having trouble connecting with the lte. just saying that this might not be just a network problem.

I've read about multiple people, including me having this issue, for some the APN IPv4 switch seems to work, but not for everyone. So what is this? Is it related to the phone hardware or software? Or is it a network problem? And will it be fixed? As this is starting to irritate me a bit..

Many People in my country (indonesia) is having similar problem. The signal somehow stuck in 3g. Forcing it to use LTE only using the app "4G LTE Switch) makes the signal gone, emergency only mode. Only a reboot would bring 4g back.
However it only acts up when using one specific mobile provider (telkomsel). Switching to my second sim, also by the same provider, didnt help. But if I switched to another provider, the problem doesnt happen.

Widespread issue in Germany as well. It's carrier independent. Had to exchange one unit. The new S7 Edge I got works fine so far, but has a pink hue on the display. Samsung QA! -.-

Any solutions or updates?

Solved?!
Hi,
I had the same problem in bulgaria with telenor.
Yesterday i got an update on my s7 edge to XXU1APCH and it seems to solve it.
This night it stayed connected. Normally i had the no service available in the morning.
Anybody else see the same?

heinda said:
Hi,
I had the same problem in bulgaria with telenor.
Yesterday i got an update on my s7 edge to XXU1APCH and it seems to solve it.
This night it stayed connected. Normally i had the no service available in the morning.
Anybody else see the same?
Click to expand...
Click to collapse
Havent got any updates here in my country.
Would u be so kind to upload the firmware using this method
here
and
here

heinda said:
Hi,
I had the same problem in bulgaria with telenor.
Yesterday i got an update on my s7 edge to XXU1APCH and it seems to solve it.
This night it stayed connected. Normally i had the no service available in the morning.
Anybody else see the same?
Click to expand...
Click to collapse
Downloaded bulgarian firmware,, XXU1APC8 is the only one available. Tried to check for update, nothing yet to xxu1apch...
Update:
Emailed Indonesian Samsung Support, they came up with a temporary solution:
go to phone, dial *#9900#
select debug level disable/low
change to mid
wait for phone to reboot.
2 hours past no signal lost yet
update: 3rd hour signal gone again

hi,
has anyone found a solution for the problem above?
in my case I have really slow internet (mobile data) on 2,3 or 4G, it's like it freezes when I try to open a page
when I connect to 4G it maybe works for a second and then nothing else, it's like 2G, very slow (wifi works normal)
can it be hardware problem? I already cleared cache and reset the phone, but it's still the same..

At me the phone can not change back to 2G from LTE, if 3G network is unavailable.
If I use LTE/3G/2G option and somewhere is not 3G network I can't receive or make voice calls.
Phone only works with 3G/2G option in network mode.
But in this case I only can use edge if somewhere only 2G and 4G networks are available.
If I use LTE network, the phone doesn't receive incoming calls.

I bought my samsung s7 gold one month ago in Lebanon (Middle East). I faced exactly the same problem, I couldn't receive any phone calls. Went to the store and they told me to switch from LTE/4G to 3G. Now my phone is always on 3G and working ok so far. But I can't put it on 4G !!!

get new simcard will fixed problem

Hi, is there a solution to this?
got info that there is a patching from samsung for this issue but since i am using custom rom, i cannot confirm this.
anyone has any update?

Same problem! I'm from Mexico and i just bought my pink s7 Edge on sunday, i've been going everyday to the carrier store and yesterday they finally gave me another one but im having the same issue! I can't take it anymore i don't know what should I do Maybe all the pink ones have the same problem? They have already changed my SIM Card, i have tried with another one and it still happens

This sounds very similar to the LTE problem on the Nexus 6P I wonder if it is actually the same problem.

Nexus 5 LTE weak signal reception.

Dear experts.
i have finally decided to share my ''unlucky epxerience'' with you.
i have got a serious problem which i have been fighting with since the first day i purchased my phone.
i have a white nexus 5 32 Gb version,D821 model.
and i'm from morocco,which means 4G will work for me because my phone is the indian version not the american version that doesn't support 4G in the rest of the world.
so,my problem is like that: when i first bought this phone i got stuck in ''emergency calls only'' for one week like every nexus 5 users did due to this known problem about the phone.
and after many reboots,clearing cashe,and searching manually for network,i got the signal again.
i never tried to switch to LTE mode,becuz i thought it would charge me a lot of data.
but,after a while i decided on and switched to LTE and got stuck again in emergency calls only !!!
i tried many things like contacting my carrier,searching manually,inserting another Sim card,force switching to LTe by dialing *#*#4636#*#*
but to no avail.
i decided to go to the nearest 4G tower and make sure if the problem had to do with 4G coverage or my phone's antenna.
then,i finally saw the LTE logo with full bar.
to sum up,now,i can't use 4G unless i'm near a 4G tower.
moreover,sometimes my phone loses signal even when i'm using only 3G which leads me to switch to 2G to catch the signal or reboot my phone many times and manually search for network.
i don't know if the problem has to do with the antenna or the bands of my phone.
and since i know nothing about flashing drivers or enabling bands.
i don't wana risk and end up by disabling any obviously enabled band.
i never took my phone to repair,because Lg service isn't available in my erea,plus i don't wanna give my phone to a dumb that would make it worse,because i fix my phone all by myself.
please help me solve this problem.
if anyone has any clue like repairing my 4G with octobox or trying to fix the antenna please.
any kind if suggestion is accepted.
best regards
Zakaria.
Edit : yesterday,i removed the back cover of my nexus 5 and found out that it's actually a D820
that's weird because rebooting the phone to bootloader it says D821 (H)
and i was wondering what does that (H) revers to ?
but the thing that confuses me is if it's actually a D820 why does it catches LTE near a 4G tower?
does that mean the bands are already enabled ?
do i still need to enable any other band to make it work properly ?
thank you so much in advance and waiting to hearing from you soon.

GPS not working during a phone call

Hi
I have a Oneplus 6 8G/128G, upgraded to 9.0.4 through the standard OTA channel. Since I changed my telephone operator, from Vodafone to Wind3, I'm experiencing loss of GPS signal during phone call. If I change my SIM and plug a TIM or VODAFONE one, and I still stay in the same cell area, the GPS signal is correct.
The only way to have GPS working during call, is to force the phone in 2G mode only. If I set 2G/3G or 2G/3G/4G the problem occurs.
So it seems that there is a interoperability problem between GPS and the GSM cell, but this is a bug of the phone: it I put my WIND3 SIM in a different brand phone, it works.
Is someone experiencing the same problem?
Thanks
Stefano

Yup, same problem here. I fear it's hardware. I've had the problem for all the latest beta versions of Oxygen OS

I experienced that it happens in some area and not in other area.. Here where I live it works well, while where I was last week not at all. It seems something related with LTE which tricks the firmware of the phone in some way. If they do not solve, I think I will change my phone...

My gps works ok if you are on 4g or 2g network, even in airplane mode. But if the network drops to 3g network the gps gets unstable, I realized this by taking a road trip.
I suggest you take this test

Yes, I can confirm that it works in airplane mode and in 2G 3G 4G mode when I'm in my home location. In some other places it does not work.
And so?

Same problem here, also with new 9.0.4 or the old version of os . I hope for fix. (forse conviene segnalarla sul forum ufficiale)

Problem has been solved: Oneplus sold and Galaxy Note 8 bought. So here is the end of my experience with this Oneplus which, in the end, cannot be used for professional purposes but only for playing...

Same problem with 6T McLaren
I have the same problem, during phone call gps signal is going away, if I put in airplane mode GPS is working wll, so it's not necessary tho have Mobil network or wifi. phone is updated to the latest version of Android 9 beta. Contacting the italian support team the say that it's correct to work in this way, because during phone call connection drop to h and gps nedd 3G or 4G for working, it's a crazy answer because in offline mode gps works correctly.

gmgunderground said:
I have the same problem, during phone call gps signal is going away, if I put in airplane mode GPS is working wll, so it's not necessary tho have Mobil network or wifi. phone is updated to the latest version of Android 9 beta. Contacting the italian support team the say that it's correct to work in this way, because during phone call connection drop to h and gps nedd 3G or 4G for working, it's a crazy answer because in offline mode gps works correctly.
Click to expand...
Click to collapse
I agree with you, this is a crazy and unacceptable answer. Unfortunately italian support teams are really bad in their job and with no technical skills (I have experienced the same with Samsung and Huawei service centers).
Anyway I think that there is a possible solution (at least with providers other than Wind-TRE): by enabling VoLTE in the service menu (https://forum.xda-developers.com/oneplus-6/how-to/guide-enable-volte-forcefully-activated-t3797538) some people reported that magically the GPS works correctly during phone call.
I was not able to let it work with my provider, Wind-TRE, because they have not VoLTE activated, but maybe if you have a different provider it worths a trial. I remember that when I had Vodafone as provider, the GPS always worked well and it started to fail once moved to Wind-TRE.
Let me know if it works!

After more tests I discovered that GPS signal is coming again after 4 minutes of call and continue to work, so this is a bug, no 4G or internet connection problem. Another problem is to contact OnePlus skilled support interface no one that admit that there is a problem, this is crazy!
Inviato dal mio ONEPLUS A6013 utilizzando Tapatalk

MI MiX 2S LTE & 4G Bands and connection problem Solved

I finally solved the problem i encountred with my mi mix 2s regarding LTE & 4G Bands and connection .
I just flashed a modem.img file extracted from the lasted rom posted on xiaomi.eu
https://xiaomi.eu/community/threads/9-3-28.49842/
i just used this command on fastboot
fastboot flash modem modem.img
After rebooting i got the LTE signal working correctly.
Just give it a try if you have the same problem
Thanks

Which baseband version do you have after that? Which network provider do you use? Thanks!

I have a Mi Mix 2S, M1803D5XA, 8/256GB model, bootloader unlocked, running Global Beta ROM 9.3.28 with baseband version AT4.0c2.6-303-0325_2303_ea9c837. The network operator is Telefonica/O2, the service provider is 1&1. LTE coverage mostly B20/800Mhz, rural area.
After losing 4/LTE connection, my phone does not reconnect automatically with the available 4G/LTE network (B20, 800 MHz). I have to change the default preferred network settings (LTE/TD-SCDMA/UMTS) to "LTE only" or "LTE/CDMA/UMTS (auto) PRL" and only then the phone reconnects to the available 4G/LTE network immediately. Rebooting/restarting the phone also helps to reconnect. So I think I have to restart the modem to trigger a reconnect. If I just put the phone on the windowsill and wait for it to reconnect the modem sometimes seems to "freeze". The phone indicates a 4G/LTE connection (four out of five reception bars), however, there is no internet connection. Again, rebooting/restarting the phone helps.
Also, if the phone has to switch from 4G/LTE to 3G or 2G it does not aggressively try to reconnect with "better" networks. "Upgrading" the connection to a 4G/LTE network takes quite some time.
I wonder why the default preferred network is "LTE/TD-SCDMA/UMTS" anyway because there is no TD-SCDMA network in Europe. I think it should be "LTE/CDMA/UMTS (auto) PRL", again, I don't know whether this is part of the problem or just irrelevant.
I noticed this issue mid-January-ish, I do not know whether it can be linked to the Mi Mix 2S' SAR value issue that was discovered by some French authorities ...
Thanks,
Lars

Being totally frustrated led me to reverting my Mi MIX 2S (M1803D5XA, 8/256GB model) back to the Chinese Beta ROM 9.4.12 yesterday evening, completely wiping the phone and locking the bootloader in the process.
Today, I've tested the "reconnectivity" a few times and surprisingly (?) the phone now works as expected, or at least much better. After completely losing the 4G/LTE connection inside a building (this was also expected) the phone immediately reconnected to the available 2G network and then to the available 4G network upon leaving the building with almost zero lag.
Chinese Beta 9.4.12 comes with baseband version AT4.0.c2.6-303-0409_2210_8fadd5d.

and here is the final solution
Download link in this post
https://xiaomi.eu/community/threads/call-dropping-or-caller-does-not-hear-me-anymore.49296/page-2
Thanks to All

bibo3002 said:
and here is the final solution
Download link in this post
https://xiaomi.eu/community/threads/call-dropping-or-caller-does-not-hear-me-anymore.49296/page-2
Thanks to All
Click to expand...
Click to collapse
sadly this is still not the solution...

futureshock said:
sadly this is still not the solution...
Click to expand...
Click to collapse
Same on my side - yet another updates and still no luck!
The only solution for now is to downgrade ROM to anything from 2018 because problem started in early 2019 ROMs

still not solved...
even some reported that the issue should not be there when using an custom aosp rom... but i had an calldrop/caller didn't hear me anymore today on my test drive with resurrection remix rom! as soon as i use another phone, tested huawei p30pro, galaxy s10+ or even the simple nokia 81104g i havent had an single issue with call dropping on the same route!
it also make me belive that after flashing ah new rom (after ah wipe) it looks like that it is working.. but after a day or a few days the problems start to appear?!

I believe I'm still having this issue whereas in certain areas I'm losing coverage and my phone won't regain services for a very long time. It's predominantly happening at home which is very frustrating. Has anyone found success in resolving this issue? I'm on Verizon and looking for any help possible.