Ive had my phone for a year, came 4.2 stock, I've flased multiple roms, modem's never had any problems. The other day outgoing messages stopped, on hyperdrive 18.1, so I factoy reset reflashed rom then no sim message. So I went back to my stock backup and no sim messag. I oden back to complete stock all is good, re rooted, recovery all good. I've tried to flash other roms now and no sim message on all I've tried. ive tried twrp, cwm, and phils. Later im going to try a non tw rom see if there's any difference. Any advice would be grateful thanks