You need a nokia phone that runs symbian S60 2nd edition feature pack 1 and above, or Nokia S60 3rd edition (IE. 6120 classic, 6121, 6110 navigator, N series). The software gives you lap times as they happen on the phone you dont need to download it from the phone. If you have a 6110 or N95 with built in GPS you can just install the software and it will use the gps built into the phone.