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How accurate is the triangulated GPS version of the non-3G iPhone?

Does anyone have any experience with the triangulated GPS used by a non-3G iPhone? How to compare this with 3G positioning? Does iPhone 3G use triangulation in the absence of a GPS signal? Is there any need to determine the accuracy of non-3G coordinates? Thank you

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I made a lot of mobile software with many different devices, including 3G iphones and 3G Blackberry, and this is what I found.

Blackberry and iPhone GPS are really good when you have clear visibility and at least 9 satellites. In some dense residential or urban areas, you can only get 5-6 satellites, which may take some time to converge.

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CLLocation "horizontalAccuracy" ( /) "verticalAccuracy" ( ).

GPS, Skyhook Wireless, MAC- Wi-Fi.

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GSM, +/- 500 ( , ).

Wi-Fi, +/- 50 .

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