It should show up in Nautilus (and, if you are using Gnome, on the desktop). You may have to tell the phone to let go of the SIMM card so it can be mounted. (Edit: I meant "release the sdcard.")
I have a suggestion: Open the notification panel and touch the USB icon while the phone is connected. On my G1, that opened a menu telling the phone to mount. On my new MyTouch 3G, it opens a similar menu, but with more options.
I tried searching online for a user manual for your phone and could not find one. This is really a user manual question.
Last edited by frankbell; 09-15-2011 at 12:10 AM.