A GSM Tri-Band phone is a phone supporting three of the four major GSM frequency bands. And the kind of phones can work in most parts of the world. In general, there are two types of tri-band GSM phones in the markets. The tri-band phones supporting GSM 900/ 1800/ 1900 MHz are commonly used in Europe, Asia and Africa. The kind of phones can work on at least one network in most countries in the Americas. While the tri-band GSM 850/1800/1900 MHz are usually used in the Americas. And this kind of Tri-Band phones can work on at least one network in most countries in Europe, Africa, and Asia. It is cost-effective and time saving to buy Tri-band phones online. A broad selection of Tri-band mobile phones are for sale here!