It is a $600 doller SIM becouse if you return the Iphone the SIM has to be with it. So it is not really free. The ones you get at AT&T are free. But they all say 3G on them.
Can one of you iPhone gurus suggest a "spare" inexpensive phone I can use the iPhone sim in? Does it need to be "unlocked" or will any cheap handset work? Sorry to be so naive, but the iPhone is my first cell phone.