How to switch from htc sensation to iphone on t-mobile?

I want to switch it and all i know so far is that i need to cut my sim card into a micro sim and unlock the phone. Will i have to pay extra or will i not? Cause basically i'm just putting a sim card into another phone.

You will not have to pay extra/

You will not have to pay extra but you will be stuck on edge in most markets.tmobile is currently unlocking markets to support AT&T iphone with potential customers coming over from AT&T.

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