It's not unlimited in the case of AT&T. They charge $59.99 for their "Data Global Add-on to Domestic PDA or iPhone Plan", which includes you 50MB of data in "select countries". This comes IN ADDITION to the PDA domestic data plan, which runs from $30 to $60 per month. OR, you can get "DataConnect Global" plans which includes "unlimited" (5GB) domestic usage plus 100MB or 200MB of international data, at $139.99 and $229.99, respectively.
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It's not unlimited in the case of AT&T. They charge $59.99 for their "Data Global Add-on to Domestic PDA or iPhone Plan", which includes you 50MB of data in "select countries". This comes IN ADDITION to the PDA domestic data plan, which runs from $30 to $60 per month. OR, you can get "DataConnect Global" plans which includes "unlimited" (5GB) domestic usage plus 100MB or 200MB of international data, at $139.99 and $229.99, respectively.
Hardly cheap, or unlimited, by any means.