A phone can only be used on a network if it supports the correct band(s). Quad-band usually refers to a phone using GSM technology. A quad-band GSM phone is one that can be used for basic service ...

This Linux PDA-phone for Asia sports quad-band GSM, a QVGA touchscreen, and a 2 megapixel camera. Other features include Bluetooth, music player, FM radio, a document viewer, and a business card ...