There are a lot of versions of the same phone - they are all made by HTC. I have the slightly previous version marketed as MDA compact II by T-mobile. Its pretty good as a pda and mobile - Jamin has better camera and wifi.
There's a newer version with all that and bulit in GPS antenna which various providers do with various satnav software. The original HTC 3300 apparently ships with tomtom6. You need to shop around - T-mobile do the phone but wihout satnav or wifi enabled. O2 do a version called xda orbit i think with copilot satnav.
xda orbit