Question [Q] [N7100] 3G Works but "mobile network not available" - [4.4.2] OmniROM

I'm posting this here since I can't post in the original OmniROM thread.

My 3G works just fine on my Note 2 but I can't make or receive any calls. The SIM card is OK, it works fine on my S3, and I don't think the phone is carrier locked, or I wouldn't be able to connect to 3G (or would I?).

Does anyone have any thoughts?