tri-band
(of a mobile phone) having three frequencies so that it can be used in different regions
Abused, Confused, & Misused Words by Mary Embree Copyright © 2007, 2013 by Mary Embree
tri-band
adj (Telecommunications) of or relating to mobile telephones that can operate on three GSM frequency bands
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014