my.loki service can automatically let your friends know where you are. As they quote it “Consider “Where are you?” a thing of the past”. If you are interested to keep your friends/family updated with your location, or maybe assure your wife that you are not in Las Vegas after informing her that you are on a business trip in Saudi Arabia , then I would recommend to register for this service hereThis service is compatible with Windows Mobile such as Samsung i780 and Symbian S60 such as Nokia n82