Unlock 3G for Boost Mobile ? [Q]

I have a iPhone 3G that is already Jail broken . I’m thinking of switching to boost mobile. I’m also running Itunes 10. Will i be able to unlock , if yes , then how ?
Please suggest .
Thanks
About Boost Mobile :
Boost Mobile is a brand of Sprint Nextel, currently operating within the newly formed division known as Sprint Prepaid Group.Boost Mobile’s Monthly Unlimited cell phone plan offers unlimited talk, text, web, & more for $50 a month, with no contract

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