Mobile device that supports voice and data communications conforming to one bearer technology, such as GSM, but on four different sets of frequencies. For example, many European and Asia/Pacific count [..]

A phone that supports four different radio frequency bands. Different mobile phone networks around the world use different bands. A phone can only be used on a network if it supports the correct band( [..]

Refers to a mobile phone that supports the four major GSM frequency bands (850/900/1800/1900 MHz), making it compatible with all the major GSM networks in the world. The 850/1900 MHz bands are mainly [..]