Linksys router and T-Mobile MDA Vario (Qtek 9100)

Recently I bought a T-Mobile MDA Vario (aka Qtek 9100). I was already using
my Linksys BEFW11S4 v. 3.0 for a while.

My Vario cant seem to 'find' the Linksys... When I turned on the Vario for
the first time, i could find the linksys with no problem, and I happily
MSN'ned for a while using my Vario. When I tried to access the internet, it
told me it didnt have an internet connection. From that time on, I couldnt
connect with the linksys anymore. Now I even can't find it anymore!

Does this sound familiar to anyone?
--
TIA, Thomas.