Tri band

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Tri band phones (also known as tri-band or triband) are mobile phones that support three frequency bands. Having more than one frequency in one device is useful to enable roaming between different countries that peg the allowed transmission frequency at different values or to allow a better coverage in the same country.

Contents

[edit] 2G

Further information: GSM frequency bands

Various countries use different frequency bands for their mobile networks and a triband phone can be used on three of these bands, generally speaking, chosen to favour two of the home country's bands, and one for roaming in other countries.

In summary, GSM frequency bands used around the world are:

  • 850 MHz (In America)
  • 900 MHz (In Europe and many parts of Asia and Latin America)
  • 1800 MHz (In Europe and Asia and many parts of Latin America)
  • 1900 MHz (In America)

2G Triband phones are mobile phones that support the GSM 900/1800/1900 MHz bands commonly sold in Europe, Asia and Africa, (for example the LG KE820 is a triband mobile phone that is sold in Europe, but works in big cities of America but not so well in suburbs).Or alternatively the 850/1800/1900 bands (commonly sold in the Americas). The Motorola V300 formerly carried by Rogers Wireless used a rare combination of 850/900/1900. A 2G Quad band (850/900/1800/1900) offers more coverage and is now quite common.

[edit] 3G

Further information: UMTS frequency bands

UMTS / HSDPA devices operate in UMTS frequency bands 850/1900/2100 or 850/1700/2100 MHz:

  • 2100 (downlink) / 1900 (uplink) for Europe and Asia (usually referred simply as W-CDMA 2100)
  • 1900 / 850 (independently, for both the uplink and downlink) for America (e.g. AT&T)
  • 2100 (downlink) / 1700 (uplink) for America (e.g. T-Mobile)
  • 850 for Australia (Telstra NextG)

UMTS / HSDPA / HSUPA is a further evolution.

Note that being UMTS / HSDPA / HSUPA tri band doesn't mean that phone is a GSM / GPRS / EDGE tri band. An HSUPA tri band might not be a GSM at all. However nearly all HSDPA or HSUPA tri band are EDGE quad band too.

A 3G Quad band offers more coverage.

[edit] Devices

Some UMTS / HSDPA 850/1900/2100 tri band are already available:

Some UMTS / HSDPA / HSUPA 850/1900/2100 tri band are already available:

[edit] See also

[edit] External links


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