is the apple iphone coming out on pay as you go or just on contract and if it is coming out on pay as you go how much will it be

just contract they all start that way for well over a year then they start to go pay as you go I got the n95 at the begging of this year and my contract runs out next March and i think it still will not be on pay and go then they do take a lonf while to happen as they want there money outof the phone frist