You must specify the GPS mode to retrieve the location of a BlackBerry® device. GPS modes include autonomous, assisted and cell site.

• Autonomous mode relies on GPS satellites only.
• Assisted mode relies on GPS satellites and servers on the wireless network.
• Cell site mode relies on the geolocation service, or the wireless network to provide the location information of the current base station.

• Specifying the GPS mode by using JSR 179
  
• Specifying the GPS mode by using BlackBerry extensions to JSR 179
  
• Retrieving location information by using the assisted GPS mode