Buy an iPhone. Now go to Radio Shack and get the cheapest GoPhone they have, it's about $20. Go home and activate the GoPhone via the instructions that come with that phone. Now unpack the iPhone and get ZiPhone and jailbreak and activate the iPhone. Now place the sim from the GoPhone into the iPhone and you have yourself an ultra cool iPhone Gophone. You can refill with cash when you can, refills can be $15, $25 and there are more amounts too. If your time runs out, you have a set amount of time which can be a month or two before the account will be cancelled for no funds. Just keep edge turned off on the iPhone, if you accidentally forget and use Safari, loading one page can cost several dollars.