Try to perform a Factory Reset via your handset menu. Select ‘Settings’, then ‘Security’ and ‘Factory reset’. Use 0000 as the security code before pressing ‘OK’.
Afterwards, try to locate a GPS position in the Navigation menu by selecting ‘Current Position’. After the acquisition process, which may take up to five minutes, you will see the GPS coordinates displayed on the screen.
Note: Mobile Satellite handsets require a clear view of the sky. If you are inside a building, tunnel, or other structure that limits the view of the sky, the satellite signal may be weak or unavailable.