How to resolve being unable to log in due to this error
How to remove or change the phone number on your Blizzard account
Changing language settings for game and/or communications from Blizzard
Information on how to change the registered Blizzard account holder name
How to move a game account to a different Blizzard account
Information on the BattleTag Change service.
A BattleTag™ is a player-chosen nickname that identifies your Battle.net account
How to consolidate multiple Blizzard accounts into a single account.
The login servers received invalid information
Information regarding the legality of sharing an account.