Visiting the US, need a SIM card

hello,

visiting in month , staying there 3 weeks. since plan visit 4 cities great if had data plan iphone 4s (unlocked) google maps , smaller stuff. not familiar of plans i'd grateful recommendations. far can tell far at&t has fastest network , best coverage (despite fact network took heat year ago).

can recommend data plan prepaid sim cards use while in us? affordability important factor (given fact i'm student).

in advance , i'm looking foreword visit us.

 

tmobile pre-paid or att prepaid going easiest come by. og large retailer have here (target, wal-mart, best buy) , should able sell prepaid cards.

 

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