Once you buy a phone it should be able to be used on any network. And if you buy phone on contract one contractual agreements are meet then phone should be unlocked. Why is it you buy a phone on contract they give you the phone at a monthly fee well somewhere in that fee your paying for a phone. Why is it once you meet there contract agreement usually 2yr. That A) the phone not unlocked and B) your monthly fee doesn't go down because I paid phone off.