How to use my verizon iphone 4 on my tmobile account?

I bought an iphone 4 in the united states with verizon and my family has an account. But unfortunetly i had to move to puerto rico with my mom and verizon doesn't work over here so me and my mom had to get tmobile and new phones. I currently have the samsung galaxy s2 but don't like it. So how can i use my verizon iphone 4 with my tmobile number?

How di T-Mobile answer your question?

You can't, verizon iPhone 4 don't use sim cards. Tmobile use sim cards.

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