Not possible. The pay as you go plans are for phones only, not tablets(requires tethering from phone). Even with the iPad or iPhone, 2G Edge is the best you get on any plan in most areas(the radio doesn't have the 1700MHz for Tmo 3G/4G support), but in select areas they are rolling out 1900MHz 3G on Tmo. Even then the $2/day(starts @12am to 11:59pm) is limited to just 2G Edge. Prepaid directly through the iPad would require the weekly or monthly data allotment pass to work on the iPad.