Database Users

EDGE Network Only - Help Need

My i9505 only connect to GSM network (Only 2g mode) After switching to auto connect (2g and 3g) mode or 3g only mode, phone doesn't register on network. (but showing some of signal bars) emergency calls only. no Data.
When using WCDMA only mode, some time phone showing H sign and connecting to Data network for 1 or 2 min. But again switch to emergency calls only
On 2G only (EDGE) mod phone work perfectly DATA and Voice calls.
Phone has original IMEI and new KNOX boot loader
I've tried the following tasks : not fixed the issue
Changing stock rom to from 4.2.2 to 4.3 and 4.4.2
Flashing custom roms (Slimkat)
Flashed Modems : ModemXXUEMFK_BMH1, I9505XXUEMKE-MODEM, I9505_ZHUDMH6_MODEM, I9505_DVUBMG1_MODEM, I9505XXUEMK9_MODEM and more...
Please help :

I have same issue from 2 daya ago
Switching to cm .. flashing different modems .... back to stock .... no use
I notice the tower where I receive signal from has changed , it has different location id number now
I even switch to many locations but still same
Where u live ?
Service provider ? I didn't bother to call , will wait a couple of days more it may get fixed
Sent from dish washer

could u fix it? method pls

Is your phone carrier-locked?
Because certain phones can't access 3G/4G if it's carrier-locked.
Where do you live and what service provider do you use? Try changing between service providers to see if you can access 3G/4G with one of those providers.
Sent from my ASUS_Z00AD

Help with mi a1 stuck on lte after qxdm

Hello everyone , i really need your help.
After trying to enable 4g+ on my xiaomi mi a1 i am left with an awkard situation. All i did in qxdm was changing the value of rfnv lte b3 ca cb config ..but being stupid at that moment i forgot to write down the default one .
On slot 2 ...everything is ok .
On Slot 1 ...i have 4g ..i can send and receive sms , i have internet connection but i cannot make calls .
On *#*#4636#*#* the voice network type is set to LTE, and it doesnt change from 4g to 3g when trying to make a call. And since my network ( vodafone romania) doesnt have voice over lte i cannot make calls from slot 1 .
If i try to change the network type from 4g to 3g ..i lose signal .
Any help would really be helpful .Thank you in advance.

Incoming/ Outgoing call problem while on 4G network with no volte support.

I have recently bought the MI A1. While buying itself it was updated to the latest may patch.
The problem is while on 4g network, I cannot receive nor make any phone calls. For calling I have to manually switch to 3g/2g mode from *#*#4636#*#* menu. Is this a normal behavior of this phone as my other phone swiches to 3g while incoming/ outgoing calls and back switches to 4g after the call is finished.
PS: my network doesn't support volte. Phone is manufactured on Feb 2018, it's not modified by any means.

That's not normal behavior.
I've never seen a phone where You have to switch between 3G/4G/LTE for calls and data.
Can You try a SIM-card from another service provider to see if it behaves differently?
If You check at https://willmyphonework.net/ are all bands supported with Your provider?
Or, in worst case of course, try a factory reset and see if that makes any difference...

Set to 3g/4g in *#*#4636#*#* menu.
Airtel doesn't support volte in all circles yet. Only rolled in few circles. In 3g/4g mode, it'll be mostly in 4g mode if nw strength is good & switch to 3g when you call or receive a call

Network bar is full but no incoming and outgoing calls

Hello,
i'm using redmi note 4 snapdragon 3/32 version for almost 1 year 6 months.
Suddenly i am facing network issue.
Though the network bar shows full network but still not receiving any call neither i can call others.
If i change network to gsm only it seems works for a while
but i want a permanent solution.
*i reset phone. Even tried different rom*
if this is a hardware issue. Is this critical?
Thank you.

Maybe it's related to your operator
Some operators switch from 4g to 3g or 2g when you receive a call or try to call someone
maybe your operator has a problem with this switch and so you are not able to call and receive

Angelo Azzurro said:
Maybe it's related to your operator
Some operators switch from 4g to 3g or 2g when you receive a call or try to call someone
maybe your operator has a problem with this switch and so you are not able to call and receive
Click to expand...
Click to collapse
thanks//

Can't make calls and receive them

I need help after the OTA January update I almost can't receive any calls, it says my phone is turned off or out of cell reception. The same is when I try to call I just can't get signal and the call is ended. Before those update when I call I can see it switching to 3g and my cell reception is always full now when switch to 3g reception is going down to nothing.
I am 4g preferred mode like before in Oreo I live in Bulgaria and using A1 network.
Basically I have to change preferred network to 2g if I want to call or receive call because if use 4g preferred the phone start to change very slow between 4g 3g and H