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Our online glossary is here to help you make sense of the terminology used in the cell phone industry. It covers mobile technologies, such as 3G and 4G, and even includes a bit of information on smartphone operating systems and the companies that make the cell phones and other mobile technology devices we all use.

What is "GSM"?

GSM is a TDMA based wireless network technology developed in Europe that is used throughout most of the world. GSM phones make use of a SIM card to identify the user's account. The use of the SIM card allows GSM network users to quickly move their phone number from one GSM phone to another by simply moving the SIM card. Currently GSM networks operate on the 850MHz, 900MHz, 1800MHz, and 1900MHz frequency bands. Devices that support all four bands are called quad-band, with those that support 3 or 2 bands called tri-band and dual-band, respectively. In the United States, Cingular operates on the 850 and 1900MHz bands, while T-Mobile operates only on the 1900MHz band.

Also known as: "Global System for Mobile Communications", "Groupe Special Mobile"

See Also: TDMA, SIM, MHz, quad-band, tri-band, dual-band

Referred to by: 2G, AMPS, dual-band, dual-mode, EDGE, EDGE Evolution, ESN, frequency band, GPRS, GSMA, HSCSD, IMEI, LTE, MEID, Motorola, Nokia, PDC, quad-band, SIM card, TDMA, tri-band, UMTS

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