Why are tri-band phones so much less than quad-band?

Joe Kramer
Director of Wireless Services
Published: December 5, 2006

Quad-band phones will work anywhere in the US and most European countries. Tri-band phones do not include the 850mh frequency, which is used by Cingular.  read more.. link to http://www.phonedog.com/cell-phone-buying-guide/understanding-cellular-technology-and-frequencies.aspx