The GPS can fall under 2 categories:
- S-GPS Simultaneous GPS, or S-GPS, is a method to enhance a mobile phone's satellite-based position reporting ability to a carrier. S-GPS allows a cellphone to receive both GPS and voice data at the same time.
- A-GPS Assisted GPS, or A-GPS, uses a data connection (Internet or other) to contact the assistance server for information. A-GPS allows a device to work out a position, even when a signal is poor.