Help: Need advice. My N900 is on a T-Mobile account in the U.S. I am travelling to Austria (Vienna) in a few days. I want to continue using the N900 without getting billed an arm and a leg in roaming charges from T-Mobile. So, I assume I need to get a temporary SIM card in Austria. Is this correct? Can anybody recommend any particular company and/or SIM card to use in Austria? Will I still be billed for any roaming charges and/or any other additional costs, aside from the cost of the SIM card itself? Should I set the N900 in any other ways to avoid any additional charges? Will the temporary SIM card allow me to use the N900 for telephone, internet, and texting?

Thank you!