Here is a review on the O2 XDA Orbit 2, a 3G PDA phone with GPS navigation. The Orbit 2 is powered by a a Qualcomm MSM7200 400MHz CPU, 128MB RAM and 256MB ROM. The phone has built-in GPS chipset.

Other features include a 2.8-inch LCD display, WiFi and Bluetooth. It has a 3 megapixel camera with auto focus and a microSD card slot for expansion.
The review is done by TrustedReviews:

Design: 8/10
Features: 8/10
Usability: 7/10
Value: 8/10
Overall: 8/10A superb touchscreen with accompanying software enhancements, and the inclusion of the excellent CoPilot sat-nav software and kit, all elevate the O2 XDA Orbit 2 from potential also ran to viable choice. If you don’t need the keyboard of the TyTN II it’s a competent and reasonably priced alternative, even if it isn’t quite as compact as one might desire.