Can you use any Tmobile data plan on a factory unlocked iphone 4/4s?

I wanna buy a iPhone but since my parents wanna stick to tmobile so i'm forced into unlocking an iPhone if i buy one. I don't wanna spend the 30 bucks/month for 4g cause between me, my brother, and my mom, its pretty expensive. So i was thinking about getting the 256 MB plan for $10/month. NOTE that i'm not really gonna be using my data cause i usually don't go anywhere that doesn't have Wi-Fi. So really, my point of confusion is if i'm able to use that 256 MB plan on an iPhone thats factory unlocked.

Yes it will work fine.

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