Quad-band

A phone that can use all four of the GSM transmission frequencies; 850, 900, 1800 and 1900MHZ meaning that it can operate worldwide, including the USA. (GSM 900/1800 MHz bands are used in most parts of the world: Europe, Asia, Australia, Middle East, Africa, whereas GSM 850/1900 MHz bands are used in the United States, Canada, Mexico and most count
Found on http://www.tuffphones.co.uk/glossary
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