Recently, my uncle just upgraded with Sprint and gave his iPhone 4s to me. Right now it's not activated with any company, so it has no service. At the time, I have a Nokia Lumia 521 and I want to unlock the iPhone so I can use that instead of the Nokia. How exactly can I do that? Do I just switch the SIM card into the iPhone and contact T-Mobile Costumer Service? PLEASE HELP ME!
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