how do i transfer my boost mobile number to an old phone whose "account was cancelled?

[Plankton]

I had the samsung galaxy prevail for boost mobile but for some reason it wont turn on. how do i transfer the number from that phone to my sisters old sanyo incognito? she let the account for it expire because she uses att now. and whenever i try to call 233 or 611 on that phone it says "to make a collect call press one" blahblahbla and when i try calling boost mobile from another phone it wont work. so how do i transfer my boost mobile account to this other phone? 10 points!