T-mobile's prepaid page lists both "Pay As You Go" minute plans and "On Demand Passes" for "Pay In Advance Mobile Internet". http://prepaid-phones.t-mobile.com/prepaid-plans Can I use my PAYG balance to purchase an "On Demand" pass for data access? If so, how do I do it, as the "My T-Mobile" website doesn't appear to list "On Demand" passes as an option for my PAYG plan. How about adding an "On Demand" pass to my PAYG with a credit card?
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