What frequencies GSM phones are using?
GSM phones are using four different frequencies worldwide. GSM networks in North and South America operate at frequencies of 850 or 1900 MHz, while most networks in other countries operate at frequencies of 900 or 1800 MHz. Japan and South Korea operate on 3G technology at 2100 MHz. We recommend quad band mobile phones for most international travelers. Since these wireless devices operate on all four of the international GSM frequencies, you ensure the broadest international coverage available. A “tri-band” phones that covers 900, 1800 and 1900 MHz might be enough for most countries. Please check the frequency at your destination country before you travel to make sure your phone supports it. The web site http://www.gsmworld.com/roaming/gsminfo/index.shtml can provide you this information.
