I just had to factory reset my Galaxy S3 due to performance issues. It was originally Verizon but I had it flashed to Straight Talk last year. After the reset it will not make phone calls or send/receive texts. I have tried updating the software but it says it is unavailable. It also says "welcome to verizon wireless your mobile number is not active or invalid" when I try to make calls. The only thing I can think of is I did not remove the SIM card before the reset. Any help would be appreciated..thanks!