Smartphones and tablets like iPhone, iPad, BlackBerry and Android have an internal GPS chip that allows them to accurately determine their position when outdoors. When indoors, other methods such as AGPS, Wi-Fi access points and cell tower triangulation are used to provide good quality estimates.
The Vismo tracking application uses all available locating techniques to accurately track a mobile phone as it travels the world. Locations are passed back to a central secure website over the internet.
The diagram above shows how Vismo can track a GPS Smartphone as it travels the world.