[mike9191]

If you can enable the GPS thru a custom rom then you would not need a data plan. If you wait for the official upgrade you will need to add either a data plan that includes GPS or a separate GPS add on thru sprint. Right now for that phone , there is no option available for either way, but I cant see sprint allowing GPS to function thru an upgrade without figuring out a way to make a buck. GPS cant be purchased thru sprint since they have very few non blackberry phones that have GPS. They have managed to bundle GPS in a vision plan with other goodies like TV, and music.....Mike ( sprint customer care rep )