The iPhone 3GS I'm using was unlocked by AT&T and was being used abroad. It bought if off someone then tried to update it to iOs6 not knowing that it was jailbroken. Now i'm stuck in the activation setup and it wont let me activate possibly because the phone wont pick up any signal. I checked the IMEI online and it's listed as 'SIM locked'. Another issue was that the IMEI begins in '00' when I know a normal IMEI begins in '01'. What can i do to fix this?