40+ Gamertag Availability Background . You can check the availability of your favorite gamertag in seconds! For all those of you who dont know about gamertags, it is like a username/unique identification for the gamer on microsoft xbox live platform. Free Xbox Gamertag Availability Checker Search Tool from www.gamertagavailability.com I have heard that it is possibly because someone had that gt and then changed and it cannot be grabbed up by someone else, but why not, why can't someone else be allowed to use the. Once you have chosen your gamertag, try to use it whenever you play multiplayer games online. An xbox live reservationid and authorization token are required. You can also check the availability of the generated gamertag! While you may have a lot of good ideas for your gamertag, you need to know that these are unique names for each gamer. After a certain amount of time wh...