Tri-band means that a phone will work with both GSM frequencies and also
the American frequency.  These phones are getting quite popular over here
in the UK.  I think most of Europe uses GSM, but I'm not sure.

Liam

There are 4 bands in use in the world -- 850, 900, 1800 and 1900MHz.

850 and 1900 are used in North America so for best coverage, coast to coast,
you need
both those frequencies.

If you never plan to use your phone outside North America, then the 900 and
1800 bands
are useless to you and you would not care.

When used in the context of GSM phones it *has* meant a phone that was
capable of 900, 1800 and 1900 Mhz. with 900 and 1800 being the
frequencies commonly used in Europe and Asia and 1900 being the GSM
frequency in the Americas.  With the introduction of GSM "850" in the
Americas it could also be 850/1800/1900 which is common for handsets
sold for use in the Americas.

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