I use prepaid verizon, it saves me about $50/mo. compared to their contracts. Before each call however, an annoying voice says "the time available for this call is x-amount of minutes." or "unlimited" if its a mobile-to-mobile call. it's so damn annoying, I can only imagine what the ads would be like? and would the person you are calling have to hear the ads too? thats just flat out ghetto.