2G doesn't work, 3G is fine - Huawei Ascend P6, Mate

Hello.
I rooted stock ROM (B520) on my huawei p6. Everything was ok for few months but suddenly i lose 2G signal (3G worked perfectly).
I installed B709 custom ROM by OXALIS v08 and I have the same 2G problem (3G works perfectly).
It's very really annoying situation because when I'm out of my town, then I don't have signal.
I can't be all the time on 3G, because 3G doesn't work out of my city.
I'm wondering of posibilities to solve the problem. I even tried to put SIM card of another operator and there is the same result (3G - fine, 2G - off).
Any idea?

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Problem with 3g

Hello guys,
Well a friend of mine sell me this GSM one V, he tell me the phone has already been unlocked an rooted but when i put my sim card i noticed that the phone had no signal so i decide to proove with another rom (my sense RC 2.0) didnĀ“t work, so I tested in the settings and I noticed that when forcing the network mode to 2g the phone gets signal and worked properly but when I try to use 3G or 2G/3G phone signal disappears and I can not navigate or call, so.. Do you have any idea of what could be happend? maybe the 3g radio got damaged?

[Q] 3g and 4g problems

since i unlocked the phone i am having problems with my phone
It refuses to stay connected to 3g networks . it connects but after a while it disconnects and doesn't connect again only( if i reboot the phone it does but drops again)
Forcing WCDMA only doesnt fix it , if i choose GSM/ WCDMA it reconnects to gsm
If i pick LTE signal i can do everything but receiving calls it says its turned off
I tried:
Installing stock firmware ( currently 4.4.2 DTM unbranded) and other custom firmware
Getting new sim card and changing carrier ( its not a carrier issue)
All Apn settings are fine
please advise
ok 4g according to info i saw i cant receive calls , however i want it to stick with 3g witch due to my problem has been impossible
signal bar drops after being full and ban no signal
Anyone?
Signal Drops == not fully compatible modem
Installed cyanogemmod and the issue is gonne used all day no issues

strange network problem

I receiven a m919 with strange network behaviour
I used a profesional tool : Octopus Box Samsung to repair EFS and NVM Area, I unlocked again and phone started to work decently (not as expected) after 1 or 2 days the phone came back as in the initial day.
To explin better:
it always says searching, but it do shows 3 or 4 signal bars, if you find network manually it finds the network but if you try to register it give error registering on network.
I dont know what else to try
when I repaired everything with the tool it started to work well, but indoors it had no network or dropped calls, usssd codes failing, etc.
outdoor it worked fine but as I said only 2 days.
in my counry there is only one network and it's 2G/edge not 3g or 4g here.
is there any trick to make these phones'modem work only at 2G mode and never try to find/connect/switch to 3g/4g/lte. etc? maybe this could make phones work nicely on 2g networks?
I have noticed most 4G/lte phones has poor signal reception here in my country.

Problem is connecting with Airtle 3G.

Guys help my my Canvas A1 is not connecting on airtel 3G since 2 days I had tried many methods bt, nothing seems to work.My area has airtel 3G network bt my A1 is not connecting when I switch to3G it says No service and after 1-2mins it automatically switches to 2G edge on 3G mode. I changed some Roms like MM and KK stock and cm13 too bt my problem is still going. Help!

H815 GSM (2G) problem - loosing signal

Hello,
I have a problem with 2G signal.
My phone random lost 2G signal. If I am not in a 3G coverage, I don't make any call.
3G and LTE signal are mostly OK.
Same problem is on any custom ROM, and official ROM (I tested V20g and now I have V20k).
It will be probably a hardware problem
Do you have someone the same problem as me?
Any idea?
I have a unlocked bootloader and I try find a solution before sending to a service...

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