Gateway GPRS Support Node is a network node that acts as a gateway between a GPRS wireless data network and other networks such as the Internet or private networks. When a GPRS device establishes a PDP Context to a specific APN, the APN selected determines the GGSN to be used.

is a packet oriented mobile data service available to users of GSM. It provides theoretical data rates of up to 170kbps. Data rates of up to 40kbps are experienced in real-world networks, depending upon device capabilities, network configurations and network load.

GSM is a cellular network, which means that radio spectrum is separated into individual coverage areas - cells, each served by a base station. Mobile devices connect to the network using the radio channels available in the local serving cell.