my dad has called a few times trying to get his iphone with no data plan but att wont let him......i told him theres a way.he has the old iphone....and after his contract i guess he just go a regular plip phone from att to save on no data plan.....how can i get his phone to be able to accept his att sim card[i guess his iphone is still activated from before]and not get charged for data but still be able to use his wifi....thanks for any help.