What Does Quad Band Mean?
Quad band is a device feature that supports four different frequency bands used in communication: 850 MHz, 900 MHz, 1,800 MHz and 1,900 MHz.
In the context of mobile phones, a quad band feature gives the user wider roaming capabilities. A quad band phone running on the global system for mobile communications (GSM) network will be able to roam anywhere in the world where GSM service is available. This is an important feature because each GSM network uses different frequency bands.