More information

External sources of knowledge

Aspicore - http://www.aspicore.com
This company is the inventor of the "Aspicore GSM Tracker", I have borrow some of their PHP code and rebuilt it to suit my own situation. This is a great place if you like to start building your own GSM / GPS tracker.

CellDB - http://www.celldb.org/
CellDB is an open database which links the cells that make up mobile networks, to their location. A very easy to use API is available as well for integration.

GSM-Tracker.com - http://www.gsm-tracker.com/
GSM-Tracker is a free and user supported, mobile location service. GSM-Tracker can help you locate your current geographical location using your mobile phone. Also, you can use additional services, such as finding friends, points of interest, etc.