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i understand that using cellular data can be very expensive but unfortunately we are going to be in places where there is no wi-fi. i know you can pay a fixed amount daily to your mobile provider that allows you the same package as you have in the uk and only charges the daily fee if cellular data is used. however, this is in europe and i really don't know about the usa. i really wanted to get an i-pad sim with a local provider to use as I have done in europe but unfortunately the usa have this ridiculous situation where you can do very little without a usa credit card, and often a social security number as well. far too much hassle. will have to dig out my account details for t-mobile and log in to see what i can get.