iRail apps question

in iPhone edited January 2014
hi I am thinking about downloading this awesome app. the reviews i've read are really good. I am going on vacation to Europe this summer so i want to see if this app will benefit me. Does anyone know if this use internet connection? also, with ATT provider, should i sign up for international coverage for the time being so i can use the phone? also, i am assuming iphone from the US works over in europe as well..

please advise.
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