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Okay. You're wrong. :) The 3G does have a GPS receiver. (Infineon I think) Yes, it is A-GPS, which just means it's GPS with the benefit of a faster startup time thanks to the data connection.
You're right that the 3G does have a GPS receiver, but the 3G A-GPS is more than that.

Using a combination of cell tower triangulation, wifi location and actual GPS, the iPhone narrows down your location as quickly as it receives any of the above 3 pieces of data. This is usually why you'll see the giant circle that gets narrowed down as the GPS receiver gets an actual coordinate from the satellite.
 
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