What is .mobi?
The .MOBI domain is the first and only top-level domain (TLD), or domain extension, dedicated exclusively to delivering Internet content to mobile devices, such as cell phones and Personal Digital Assistants (PDAs). The .MOBI domain was created with the specific purpose of directing mobile Internet users to Web sites that are constructed to work on handsets. All Web sites that use the .MOBI domain must be optimized for easy viewing on mobile devices. If a Web site name ends in .MOBI, the user can trust that the site is created for viewing on a mobile device.
Anyone can register a .MOBI domain, extending the reach of your Web site by building a site specifically meant for viewing on mobile devices. The registrant must comply with the rules and best practices for .MOBI content, as specified in the mTLD dotmobi Switch On! Web Browsing Style Guide.