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A Tri-band GSM phone is one that supports three of the four major GSM frequency bands, allowing it to work in most parts of the world. The two most common kinds of tri-band GSM phones...
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Today, most telephones support multiple bands as used in different countries to facilitate roaming. These are typically referred to as multi-band phones. Dual-band phones can cover GSM networks in pairs such as 900 and 1800 MHz frequencies (Europe, Asia, Australia and Brazil) or 850 and 1900 (North America and Brazil).
In telecommunications, a multi-band device (including (2) dual-band, (3) tri-band, (4) quad-band and (5) penta-band devices) is a communication device (especially a mobile phone) that supports multiple radio frequency bands.
23 cze 2019 · You may use a tri-band 850-1800-1900 unlocked cell phone in Europe, but you'll be giving up coverage in the 900 band, which is the most common band for international cell phone communications.
Many GSM phones support three bands (900/1,800/1,900 MHz or 850/1,800/1,900 MHz) or four bands (850/900/1,800/1,900 MHz), and are usually referred to as tri-band and quad-band phones, or world phones; with such a phone one can travel internationally and use the same handset.
