In the latest update to Throne and Liberty, in order to ensure the security of player accounts, it is now officially required that all players sign up for the Device Security Service when logging into the game.

This article gives you full instructions on how to do this.

Step 1: Enter the game and click to start signing up for security services

Step 2: Use your current mobile phone number to receive the verification code

If you wish to change your bonded mobile phone number, please complete the changes on the NCSoft website.

Select [My profile] - [change phone number]