My Samsung Galaxy 2 (SC-02C) has been rooted and upgraded to 4.1.2. It seemed that everything, all phone functionality, was fine.
However, I've discovered that I can not send SMS with my phone. I can receive SMS from anyone from any carrier in my area just fine. I've asked at my service provider (DoCoMo, in Japan) and was told that I have the service enabled and my account with them should be fully operational.
I wouldn't have imagined rooting and upgrading the phone would impact SMS, but that seems to be the case.
How might my SMS functionality be impacted by my current ROM, and how can I fix it?