Can I port phone # from other carrier onto T-Mobile prepaid?

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http://androidforums.com – So my wife has an ancient iPhone 3G with a nice big crack on the back (better than the front, though, right?) and I have an EVO 4G. Neither of us are on contract and I'm eyeing the new Nexus 4 for both of us and switch us from AT&T (her) and Sprint (me) to T-Mobile. The $30/mo 100 minute Talk "unlimited" data plan looks like a terrific fit for us (I used 37 minutes last month). My question is: Can I go the prepaid route with T-Mobile and have our phone #'s ported over from our current carriers? If so can anyone outline the process? Thank you in advance for any guidance. (General)