Okay, I'm a cell phone n00b. I'd like to get an iPhone, but I don't want to give money to ATT. Are there any carrier choices in the USA? Maybe in the near future? My ideal would be an iPhone where I purchase a card to add minutes to it instead of a fixed monthly contract. Anyone know if this can be done? Thanks for any info on this. Like I said, I'm a n00b at this stuff.