I am an American living in Japan. My work has me travel to a lot of countries in the region. I have a Japanese phone, but even if I unlocked it, it wouldn't work outside of Japan. I am going to get an unlocked Droid phone (my last one died), and then just pick up a SIM card in each place to use it. I am thinking of picking up a dual sim phone. Looking at two elements. 1. What are the specific bandwidth/cell modes I need to ensure it has to work the most around Asia/US and the world? 2. What Droid phones has most people found to work best when traveling in Asia/Us and around the world?