[Schlips1]

Hello,

sorry, it took a while to answer. It worked - once - to use a phone as a modem with the 1,49 USD daypass. The bad thing about that is, most phones not coming from T-Mobile US do not have AWS (UMTS 1700 MHz). So you only get EDGE and no high-speed.

The easiest way to use high speed access was to get a stick from Radio Shack (was on sale for 79,99 USD) and activate an other T-Mobile US Simcard. Even w/o credit you get directed to the My T-Mobile pages (you get an other menue for data Sims) and to choose a pass. There are no restrictions, eg. you may use it for VoIP.

So there are in fact two data plans:
- The 1,49 USD plan for voice prepaid (planed for use on mobile devices)
- The volume plan (10 USD for 7 days or 100 MB, 30 USD for 30 days or 300 MB or 50 USD for 30 days or 1 MB) for data prepaid (planed for use on a laptop / pc)

You have to use a Sim with a data volume plan once a year, otherwise it gets deactivated. But a new data sim is for free....