sorry if has been asked before, if buy unlocked iphone 4s use on t-mobile, can switch at&t, verizon, or sprint later on?
if buy unlocked iphone, can use on at&t or t-mobile. cannot use on sprint or verizon because cdma technology, means don't use sort of sim card phones. data stored on phone itself.
at&t , t-mobile, gsm technology meaning use sim card phones. in case of iphone 4 , 4s, need micro-sim card. data stored on sim card, although can backup contacts via icloud, computer or sim card.
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