Find "Positioning methods"
Press the Menu key.
Press Settings.
Press Application settings.
Press Positioning.
Press Positioning methods.
Select GPS settings
Press one or more of the following positioning methods to turn them on or off.
Assisted GPS
Assisted GPS
Integrated GPS
Bluetooth GPS
Wi-Fi/Network
Network based
When the box next to the menu item is ticked (V), the function is turned on.
Exit
Press the Menu key to return to standby mode.