Ok, I've got a Sprint Centro that I'd like to give to my mother who uses Alltel. I know it's possible to activate Sprint phones on Alltel's network. I actually just activated a HTC Mogul for my father. That wasn't quite as tricky though, since Alltel actually has that phone, and I was able to just flash it with Alltel's ROM.

Could someone tell me what steps I'd need to take to get the Sprint Centro working on Alltel's network?