Why am I not receiving my incoming calls (Samsung Galaxy pop/mini)?

I have updated my samsung galaxy mini/pop from 2.3.6 to 4.2.1 using custom ROM cyanomod ver 10.1. After the update I found out that I'm not getting any incoming calls. It is not the carrier problem because I tried using my sim in another phone & I could get incoming calls on that phone. Tried Factory reset as well but no luck
Phone is useless without being able to know if someone's calling !
Any suggestions/ideas on this are more than welcome.

Thanks in Advance !

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