GSM
Global System for Mobile Communication - an open, non-proprietary digital wireless technology platform.

Hertz (Hz)
Measure of frequency or cycles per second. Usually measured in millions as Megahertz (MHz) or in billions as Gigahertz (GHz).

HTML
Hypertext Mark-up Language - the language used to create web documents

HSCSD
High Speed Circuit Switched Data. Circuit-switched wireless data transmission for mobile users at data rates of 28.8 Kbits per second or higher, compared to a maximum of only 9.6 Kbits per second using traditional GSM networks.

IEEE
The Institute of Electrical and Electronics Engineers is a US based organisation providing expertise across a wide range of engineering fields. One of its main areas of activity is the development of industry standards.

MMS
Multimedia Messaging Service (MMS) is a 'store and forward' messaging service which allows mobile subscribers to exchange multimedia messages with other mobile subscribers. MMS supports the transmission of additional media types: text, picture, audio, video or a combination of these