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Can't receive calls!

Greetings all,
i am having a weird problem with the latest updates of the 4.4.4 / 3.0.16 Sultan ROM, im a big fan of Sultan so i pretty much tested all his ROM updates and all and i never had a issue like this.
The problem is i can't receive calls / text messages , but i can make calls / send messages , and everything else works perfectly.
I have tested my SIM on another phone and i was able to receive calls so it is not a SIM problem , i just did a full wipe and reflashed all and i am having the exact same issue.
Any suggestions? Anyone that had the same problem? Anything would help.
Could it be my phone? But why can i call someone but they can't me?
thank you

Ok i found out what the problem is , network type was set to: WCDMA preferred , and after setting to GSM Only i can now receive calls and messages, but after rebooting the device it switches back to WCDMA preferred.
And i do not know why it stopped working out of nowhere , maybe its cause of my carrier.. :/

Unable to receive calls

Hello,
I bought a mi mix 2s some time ago and it's currently running the china rom because I can't unlock the bootloader the next 10 days.
First of all I can call other people and I can use mobile data. Also I'm able to receive calls if the sim is in my old oneplus one.
Now to my problem:
Today I realized that there must be a problem if someone calls me but I couldn't really figure out under what circumstances the issue appears.
However, I could figure out the following:
If I'm on wifi calls work most of the time
If I'm on 4g I don't receive calls most of the time
If I'm on H+ I receive calls most of the time
If the phone is locked I either get the call or the mailbox answers
If I don't get the call there are two things that happen on the phone that is calling me:
If it's a samsung theres just one loud beep and the call ends
If it's a LG there are fast beeps (similar like if the phone is busy)
Thanks in advance for any help
Flatric
EDIT: Just figured out that the problem is that the phone takes too long to switch from 4g to 3g since VoLTE is not supported by my carrier... Found some guys in a forum who complained about the same problem but with a oneplus phone... I'm still open for any ideas that could fix that Maybe someone from germany here who uses O2/Eplus network and got the same problem?
EDIT2: http://en.miui.com/thread-935378-1-1.html Used this to enable VoLTE but can't test if it's working until tomorrow

Fixed it by the way by enabling VoLTE with the miui dialer code explained here

Oneplus 8 voice calls break up(?)

Hi there. I have a Onplus 8 (IN2013) and for some reason when talking on the phone sometimes the incoming conversation breaks up so as to make it unintelligible. I ask the caller to call me back and the same problem happens. When I asked the caller to call on my lady's Oneplus 6 it worked fine.
I use T-Mobile with both VoWiFi and VoLTE enabled. The Oneplus 6 is exactly the same. The problem occurs only on and incoming phone call. It doesn't happen when using Google Duo or similar. The weird part is that only my phone is affected, no others.
Does anyone have an idea of what the problem might be? Is there any way to fully reset the connection(s) to see if that helps?
Thanks,

Dropping calls

Hi, the problem i have is when i call someone or someone calls me we can talk for a few minutes then i can hear the caller but apparentley he can't hear me then after about 20secs i get the call ended message, this is the 2nd new phone i've had with the same problem,the sim card was replaced with new on both phones.It's running the latest update. Also i'm with vodafone uk.
Thanks.

strange issue

Question IQOO 7 Funtouch OS 12 update. Jio network unable to place calls

Updated to PD2055BF_EX_A_6.70.35 yesterday.
Unable to receive calls and SMS on jio network now.
Can anyone please help me out? Thanks in Advance.
By the way the update is not beta. These many bugs are not expected.