Ok, so I wasn't exactly correct, and since I said "I believe" I wasn't entirely wrong........So, moral of the story is: you might be able to use your iphones for locating the beer store up north....but not very quickly due to satellite signal issues. That will help immensely if you're doing turn by turn: turn left 100 yds behind you lol........You are wrong.
It uses cell towers to assist in faster connections with various apps. It does have pure GPS though. I use a third party GPS software and it does not use a-gps, so it takes a fair bit longer to connect than google maps does as it's purely sattelite connections.
But still: 5 miles outside Huntsville you can't use it......how many other places can't you?
(for the record I was WRONG about GPRS, it doesn't use GPRS, it uses A GPS, mixed up the acronyms)