I Believe The Only Sprint Phone With Actual 'built In GPS' Is The Sanyo 7050. Other Phones Are GPS Capable, And Can Determine Your Location By The Distance Your Mobile Device Is From The 3 Nearest Towers. But They Do Not Have Built In GPS Per Se.
Wrong.
You're talking about triangulation, which is possible on any service that has properly ID tagged towers. That's how "my location" on Google maps works, even on old phones before GPS was widely available ("somewhere in this ginormous circle").
However, on Sprint, all phones have emergency location assisted GPS that the FCC mandated exist on every CDMA phone. This means that the phone has a very primitive position receiver, which unlike a full-fledged GPS only has a limited view of the GPS satellites in the sky. Without being able to process enough satellites at once, this simple system can't really get a cold fix on its own. However, when combined with location ID from the local towers, these phones can actually get
a perfect position fix as accurate as any standalone GPS unit, and within seconds as opposed to the few minutes it takes a standalone to calculate a cold fix position.
The problem with this method is that you need the carriers to feed you the location info from the towers, which they won't give you for free. That's how the navigation based services such as TeleNav, Sprint Family Locator, etc. work.
However, there are now a handful of phones that are using the GPSone chipset, which support GPS standalone mode as well as the A-GPS and carrier dependent modes. Examples of devices on Sprint include the Samsung Instinct, HTC Mogul and Touch, and if I'm not mistaken also Motorola Q9. These phones will get an instant fix with a dead-on location without any help from the towers using line-of-sight to the satellites in the sky just like any other GPS routing device. Install some mapping software with turn-by-turn directions, and you won't have any need for a Garmin.
And even if you don't have one of those aforementioned phones, you could still pay the service fee for TeleNav or the like. Bottom line is that saying "Only Sprint Phone With Actual 'built In GPS' Is The Sanyo 7050"
is about as incorrect a statement as I've seen here lately.Not that it has anything to do with this thread, just FYI.