I PHONE 4 8 GIGA BLACK
I HAVE I PHONE 4 BUT I CANT PUT MY SIM IN THIS PHONE HOW IS CAN WORK
iPhone 4, HOW I PUT MY SIM INSIDE IS NOT HAVE
does it say invalid sim or does it not have a sim tray
if the former you need to contact the carrier it's sim locked to and ask your options
if it does not have a sim tray then it's not a gsm phone but a cdma phone and can't be used as gsm networks