Tmobile switching to iphone, what do i need to do?

My Tmobile samsung galaxy s2 broke and my friend is giving me her old iphone 5. What do I need to do to get it to work with my sim card and memory etc.
It's not jailbroken or anything. Do I need to do that? And do I need to notify my provider or anything?

If it is a T-Mobile phone or a factory unlocked (directly from Apple) phone then all you need to do is switch your SIM card.

If it is not a T-Mobile phone, you can still use it if it is an AT&T phone.AT&T would have to unlock it (which the owner would have to do, and AT&T will not do if it has been reported lost or stolen or is linked to an account that is not in good standing). If it is a Sprint or Verizon phone it is not usable on T-Mobile.

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