This version will fit smartphones as well as PocketPC / MDA / XDA as long as it runs Windows Mobile and uses the GPS intermediary driver from the OS (GPS Settings icon - manage automatically ON) The other Reperion05.cab has more features but many of them were rarely used, so the new 08 is lightweight. O yes, before you forget, set your update frequency via the config screen to something above 14 (seconds) to 1000 (seconds) any higher number will make it a distance setting. questions will soon be answered on http://live.reperion.com for now, check http://geocool.reperion.com keep sending images around 640x480 or 1024x786 for best results