I have been using my wife's old iphone as a phone only. I turned off cellular data for a long time every thing was fine now att want's to add a data charge. they are trying to tell me the phone is still using data. the phone say's no data is being sent or received. are they useing the phone signal to tell if it is a data phone I have other phone's that are data that I don"t have a data plan and they don't try to force me to buy one. somebody was saying about a false APN. I know it's not wifi because i used one for years for the internet with no problem . any information would be welcome