When you arrive the US airport, go to the counter providing telephone service. They will show you the plans. iPhone works. We did it last time and we had access to Internet, local calls, long distance calls ...
The plan we bought was around US90 for 1 month at 2.5G, 500 mins overseas call, and unlimited data and local call.
All things bright and beautiful. All things great and small.
All things wise and wonderful. The Lord God made them all. Cecil Frances Alexander 1818-1895