You may have heard of the terms American frequencies or European frequencies when talking about mobile communications. Your phone has to support the "right" frequencies when abroad. But how to know what frequencies are used in your destination? Let's find out. Technology can be hard to understand sometimes, especially if you want to learn about the fine details. The same counts for mobile telecommunication technology - that is probably even more complex to grasp. Yet, having a basic understanding of how it work can improve the way you travel with your phone. Otherwise, you may be disappointed to learn your phone does not work when overseas. But why is that the case? That has to do with the frequencies used in the world, American and European, and ITU regions. In this video, I will explain it all.