I have exbal on a att 8525 and it works perfect. It must be windows mobile pocket pc. It will not work on a windows mobile smartphone. Perry has a pdf on his site that list the difference between the two types and examples of phones that will work. A windows mobile pocket pc has touch screen, like tilt, touch pro,. A windows mobile smartphone does not have a touchscreen like blackjack,
Im not sure which one it was but there was a treo that it would work on, i bet if it has a touch screen it will work.
Compared to my blackberry sucks as a phone but great for exbal.