I want an Iphone running on T-Mobile?

Hi, i'm 14 years old and I want an iPhone. My family has T-Mobile and my parents won't switch to ATNT. How can I get an iPhone on T-Mobile? Do I have to get an unlocked iPhone? And if I do get one, how do I make it work? Also, even if I don't have internet in my T-Mobile plan, can I still go on the internet for free or do I have to buy that for my plan? Right now I have the Gravity T but I don't have internet in my plan, only text and calling. Thanks.
 
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