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The A-GPS method does use an internet connection (you must determine the access point) and thus you will have to pay data tranmission costs if for an operator as access point. A-GPS is a network service.
For a very fast (thoug not very accurate) position fix you must use network based method. This is used to get information from the cellular network.
In N95 you may choose these from Tools - Settings - General - Positioning - Positioning methods