Do I need a tri-band mobile phone when traveling abroad?
It depends which frequencies your dual-band phone uses, if you’re from the US there’s a very good chance your dual-band phone won’t work here in Asia. The most commonly used frequencies in America are 850MHz and 1900MHz, the most commonly used frequencies in Asia are 900MHz and 1800MHz. You can check this website to find out which frequencies are used in the countries you’re going to and which frequency the company you have your service with uses. If you’re coming to Bangkok, you can buy a used phone for as little as $20-30 at places like that MBK Mall that will for sure work in most Asian countries: http://www.gsmworld.com/roaming/gsminfo/…
