The .tel extension allows any individual or company to collect all of its contact information in one place at one easy to remember URL. As opposed to the .mobi and other existing extensions, companies or individuals with .tel need not configure a mobile-friendly or computer-friendly website in order to make contact details available. The.tel extension serves as a directory, rather than a website, and offers users a multi-media business card... Source: http://en.blog.legitiname.com/2008/11/27/the-tel-extension-a-universal-business-card/