Visiting the US, need a SIM card

Hello,

I will be visiting the US in about a month and I will be staying there for about 3 weeks. Since I plan to visit 4 cities it would be great if I had a data plan with my iPhone 4S (unlocked) for google maps and some smaller stuff. I am not familiar with any of the US plans but I'd be grateful for some recommendations. As far as I can tell so far AT&T has the fastest network and the best coverage (despite the fact that their network took the most heat about a year ago).

Can anyone recommend any data plan prepaid SIM cards I could use while in the US? Affordability would also be a important factor (given the fact that I'm a student).

Thanks in advance and I'm looking foreword to visit the US.

vietalogy said:

http://www.straighttalk.com/ServicePlans

Click to expand...

Thanks for this. Do you know after how much MB do they throttle the speed?

reclusive46 said:

http://goredpocket.com/ they will even ship to UK. They use AT&T's network.

Click to expand...

I'm from Germany - and the plans seem very expensive, since I will need internet often to check directions and other stuff.