Okay, so I go my S3, got the JB update before I ever left the store. Got recovery, root, unlocked boot loader. Flashed CM10 stable, AOKP milestone 1 like them both. Played with some 4.2.1 previews and the next morning I had data but couldn't send SMS or make a call. Did the normal things, data wipes, cache wipes, so on. Even flashed factory image via Odin. All to no avail. Got everything back stock, cleared root counter. All having data but no SMS or calling ability. Ended up getting a new phone after test were done, sim card replaced yada yada. Then I read last night about 4.2.1 ROMs crashing the radio and breaking SMS and phone. My question is, is there any validity to this and if so is there a way to fix it.