[Q] Mobile Network not available after Flashing to custom ROM topic

Hi guys, :)
This is my first time posting a thread in here. I need your help. :(
My phone is Samsung Galaxy S2 i9100.
Baseband version: I9100XXKI3
(screenshots attached for more info)

I rooted my phone By using Odin3-v1.85. and flashed the recovery to cwm 5.x (i can't remember version) and tried to install custom ROM OMNI
(omni-5.0.2). :cowboy:
I accidently downloaded and installed OMNI for i9100G version. But my phone is i1900 version. :confused:
(I downloaded this omni-5.0.2-20141222-i9100g-HOMEMADE.zip ). i forgot to backup previous ROM .:(
Then i was unable to Turn ON my phone because every time i turn it on, it come back to recovery it self (it's a bootloop i think).:crying::crying:

then i flashed the recovery to CWM-KitKatCompatible-i9100 (version 6.0.2.7) and installed custom ROMs and tried (PACMAN,CM,AICP).
It works fine. everything is just perfect. But i can't make calls or receive.
It says "Mobile Network not available". when i call my phone from another phone i hear ringing it. But nothing shows in my phone. after few seconds i got a Missed call Alert. But this happens only sometimes. All the other times. i cannot call it from another phone.

I tried reset and flash modem using CWM as well as from odin. but no luck.

Please Friends Help me. I don't know whether i put this thread to right section or not. sorry about that.
I did all of these things by surfing XDA forum (as a Guest). And i'm happy about what you guys are doing. Keep it up.:good::good:
(sorry for bad english)

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