From Forum Nokia Wiki

ID	KIS001125	Creation date	October 7, 2008
Platform	S60 3rd Edition	Devices	All GPS-enabled devices
Category	Symbian C++	Subcategory	Location

Keywords (APIs, classes, methods, functions):

Description

The GPS positioning methods can only be enabled or disabled by the end user of the phone. Positioning methods cannot be changed programmatically.

There is an API in the S60 3rd Ed, FP2 SDK plug-in to launch the location settings UI from an application. For more information, see CS001035 - Location Settings Launch API.