GSM’ stands for Global System for Mobile Communications’, one of the leading digital cellular systems. GSM uses narrowband TDMA, which allows eight simultaneous calls on the same radio frequency. It is the de facto standard in Europe and Asia.

GPRS’ stands for General Packet Radio Service’, a standard for wireless communications which runs at speeds up to 115 kilobits per second, compared with current GSM systems at about 9.6 kilobits. GPRS, which supports a wide range of bandwidths, is an efficient use of limited bandwidth and is particularly suited for sending and receiving small bursts of data, such as e-mail and Web browsing, as well as large volumes of data.