HT1976: iOS: Understanding cellular data networksLearn about iOS: Understanding cellular data networks
Currently Being ModeratedDec 17, 2013 3:48 PM (in response to Karlie428)
Yes, ATT will not allow an iPhone (or any smart phone) on their network without a data plan. They have been known to add a data plan to your bill once they detect you are using an iPhone.
Even if you do not use any data, they will charge you for a data plan if using a smart phone.