I have a spare iphone 4 for att that I would like to give to my mom and she would use it on Straight Talk. I completely reset the phone and now I cannot get past the activation screen without inserting my sim. Don't I have to jailbreak and unlock the phone for it to be used on straight talk? How could I do this because If I use my sim, it would be using my line and phone number. I'm very confused. Help please?