An ETSI standard for packet-based wireless data communications at speeds up to a theoretical 171 kilobits per second, for continuous connection to the Internet, for portable computers and mobile phones. Addition of Virtual Private Network facilities will allow a degree of security for mobile access to important data. GPRS is based on the Global System for Mobile infrastructure, using up to 8 time slots (provided for 8 voice calls on a given frequency) only when there is information to transmit, rather than completely reserved as in a voice circuit. GPRS is being developed into Enhanced Data GSM Environment (EDGE), using a new modulation scheme for higher data rates up to 384 kilobits per second, as a step on the way to Universal Mobile Telecommunications Service (UMTS). See also: Virtual Private Network.