Im on Tmobile with my
n95 as well. Everything works OK but naturally as Tmobile isn't selling the phone, it isn't supporting it much either. I have discovered that most of the user manual service commands that Nokia lists simply don't work on Tmobile. YOu can do #646# to get minutes used and so on, but for instance, you can't get your MAC address as described in the user manual; it comes back with an error. I'd be interested in any tips etc for getting everything working under t-mobile...
I use WLAN for web and would never use it through t-mobile, too costly...