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In telecommunications, the terms multi-band, dual-band, tri-band, quad-band and penta-band refer to a device (especially a mobile phone) supporting multiple frequencies used for communication. In the mobile case, the purpose of doing so is to support roaming between different countries/regions whose infrastructure cannot support mobile services in the same frequency range. Two frequency bands are used by GSM services in the US. Two different frequency bands are used by GSM services elsewhere in the world. Ideally, you'd want a phone that can work on all four bands - commonly called a quad-band phone. But these are still rare and expensive. If choosing a tri-band phone as a second best choice, be careful which three bands your phone has. Some bands are more useful than others, depending on where you travel.