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@fussballclub
But until I have a large enough hallway I am unable to prove this statement is actually true:
The iPhone 3G and all subsequently released iPhone models use A-GPS -- or "Assisted GPS" -- which in basic terms accesses an intermediary server when it is not possible to connect directly via satellite -- indoors, for example -- and this server provides the nearest satellite with additional information to make it possible to more accurately determine a users position.