TM506 GPS locks the location really fast. Try its preloaded TeleNav software, I got a lock in less than a minute. Way better than n810's sucky GPS, which is the motivation of using Tm506's GPS instead of n810's. Having a data plan is a separate issue, it doesn't improve n810's GPS lock time. The battery was drained pretty quickly too on n810 if GPS is turned on. How frustrating would that be when you lose half of the battery power and it still hasn't got a location lock!