What can i do to use a boostmobile phone with Tmobile?

Nothing. Boost (i.e. Sprint) is CDMA, T-Mobile is GSM.

http://hubpages.com/hub/Will-that-Smartphone-I-Bought-Elsewhere-Work-on-My-Network-Unlock-Flash

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Kasey C, PC guru since Apple II days
Change is inevitable, except from a vending machine.
 
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