take your sim card out of your iphone. u can still have GPS use since if u turn on airplane mode you lose gps
-use skype to call skype people
-use an app called "magicjack" to make free phones. free to register and people can use a toll free to call u
-Vtok lets u use google talk free
-if you have a laptop use gmail for phone
WIFI is your best friend in the states and will save you ridiculous roaming charges
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