My cousin gave me her iphone 4, Can i use it? (read details)?

Ok, so my cousin recently gave me her iphone 4 that she doesn't use anymore because she switched phones. The phone still has her sim card though and i have t mobile prepaid and want to switch my service to the iphone can i do that? Do i have to unlock it?

Yes, you do have to unlock it (I'm assuming it was on AT&T before).It's possible AT&T would unlock it for her for free, otherwise there are some mom & pop phone stores that might unlock it for you too. Once it's unlocked, it should work fine with a T-Mobile SIM card.

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