How Do You Program A T-Mobile Phone To Alltel Service?

I have a Samsung Gravity T-Mobile phone, is it possible to program it to alltel service, and if I can how? Thanks.How Do You Program A T-Mobile Phone To Alltel Service?Samsung Gravity is a GSM phone, while Alltel runs on a CDMA technology. GSM is not compatible with CDMA, and vice versa. So it is not possible to use a GSM phone on a CDMA carrier. You can only an unlocked GSM phone on another GSM carrier.