U.K. first and so far the only 4G mobile provider is using EE4G.ME domain name on its social channels. They didn't get 4g.ee domain name, which is owned by Estonian Go Network, and would be ideal, yet EE4G.ME is a great choice.
EE4G.ME is plugged into po.st service which generates links like http://ee4g.me/UPbWj ... http://ee4g.me/LNvDUN ... http://ee4g.me/UPbWjA ...
Interestingly enough, whois records show a private registration of the name. There may be more news to come soon.