Follow the steps below to log in to your Activision/Call of Duty account and link it to your Call of Duty: Mobile account in-game.
 
Please note: Your progress in Call of Duty: Mobile will be tied to the original Activision/Call of Duty account you link. Once linked, the Activision/Call of Duty account cannot be unlinked, and progress will not carry over to another Activision/Call of Duty account if you choose to log in with different credentials.
 
 
I logged in to Call of Duty: Mobile using an existing login option such as Facebook/Line/Game Center/Google Play
 
  1. Tap Settings (the gear icon at the top of the screen).
  2. Tap the button in the top right corner of the screen that indicates that your preferred social account has been linked.
  3. Tap the Call of Duty button from the options provided.
  4. Once the browser opens, enter your email address and password and tap Login Now.
  5. After successfully logging in, you shall receive a message saying, "Login successful. Log in using your Call of Duty account" and the game will relaunch.
  6. Tap the Call of Duty icon at the login screen to log in to your account.
 
I logged in to Call of Duty: Mobile using a Guest account
 
  1. Tap Settings (the gear icon at the top of the screen).
  2. Tap the Link button in the top right corner of the screen.
  3. Tap the Call of Duty button from the options provided.
  4. Once the browser opens, enter your email address and password and tap Login Now.
  5. After successfully logging in, you shall receive a message saying, "Login successful. Log in using your Call of Duty account" and the game will relaunch.
  6. Tap the Call of Duty icon at the login screen to log in to your account.