The main advantage of a UIFN number is that the same number can be used for different countries. Something that usually gets a thumbs up in the marketing department. Calls to these numbers can easily be routed elsewhere worldwide. This means you don’t need customer service centers in each country. UIFN numbers provide an easy way to enter new markets and to establish international presence and accessibility. That’s why they’re often used by large multinationals for international customer and technical support.