The only pda or phone's compatible with george are the one's which run the Palm operating system.
The older Palm phones are good but dated now, the new ones have an upgraded system which is no good. IE, the Palm Pre.
I stopped using Pocket George for this reason.
You can pick up a Pda off ebay for abot 50 quid, Just make sure it has the right operating software and you wont have any problems.