If I want to upgrade from a dumbphone (no data, just unlimited texting on a family plan) to a used iPhone 4, can I just got into an AT&T store, buy a microSIM and insert that into my phone?
Is there anything else I need to do? Will they start charging me for data even if I don't use any?
Is there anything else I need to do? Will they start charging me for data even if I don't use any?