This feature needs to be ready by 10 December 2014.
Need to add "Phone" tracker on the existing trouver app.
A new tab called "Phone" should be created.
In it, user can add Phone number they want to track. The number is not exclusive to him only. The backend will have to make sure this.
In the background, periodically, the app will grab the phone's phone number and GPS location and send to the server.
The user can then see the phone he is tracking in his list with the "last seen" value.