Hi all, My sister is in Florida,US and she is planning to buy an unlocked iPhone 5, as and when it comes out. She is an at&t customer for last 3 years band she has a specific plan, under which she can opt for data plan on a monthly basis. So the question is, if she buys a non-subdizided iPhone for full retail value and starts a data plan. So is she liable to keep it on for as long as she owns the iPhone or she can activate and deactivate according to her will, just the she does right now on her old htc phone. Any current unlocked iPhone users, please clarify on this. The reason for this that she needs data plan only she is traveling and otherwise, she has wifi everywhere throughout the day. So that's why it makes sense for her to get the unlocked one and not pay a premium on form of data plan every month. Please help.