Just an FYI from someone who spend way too long selling phones. There are two main types of digital programming languages. CDMA and GSM. GSM is the more globally used system. Infact CDMA really isn't used much at all out side the USA. Basically when you are looking for a phone, you need to find one that has been used on T-mobile or AT&T/Cingulars system since they use GSM. Depending on the location you'll probably need a quad band phone. To make it simple if it doesn't take a sim card it probably won't work. And if it does you need to make sure they use the correct badwidth. Any quad band phone will do the trick, a tri-band phone might, depending on the location.