Can T-Mobile carry my iPhone 4s or 5?

Hi. My parents are gonna give me an iPhone 4s or 5 because it's the one I want, but they say that we must carry it with T-Mobile. Are the iPhone 4s or 5 available to be carried by T-Mobile; what does 'unlocking' an iPhone at T-Mobile mean? What should I do? (NEVER had a phone before)

Tmobile doesn't carry the iphone yet. Will start in june.
you can get a unlocked iphone 4s $649 or 5 $899 and use it on tmobile but no 3g only 2g data.

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