I know a little about T-Mobile hotspots. I have been DoSed while on T-Mobile, but it didn't do anything, quite honestly I didn't notice until I checked my firewall logs. All T-Mobile connections (at least in my area) go through a gateway that appears to be a Sparc Station running Solaris, I imagine there is some sort of firewall in place.

Moddefokker, yes there is a definite possibility of launching attacks from a hotspot. I doubt T-Mobile is much of a possibility due to the fact that it requires a logon to get through the gateway, but there are many other free hotspots, and of course wardriving will give you a whole buttload of open networks that could be used maliciously.


EDIT: The main danger in my mind of wireless hotspots is the lack of encryption. It is so incredibly easy for someone to just run Ethereal. If you have a private logon, IE T-Mobile. It's up for grabs.