How to switch account in call of duty mobile?

Select BASIC INFO from your account’s drop-down menu. Select EDIT next to your ACTIVISION ID and type in a new Display Name.

On the home screen, go to ACCOUNT and choose Activision Account. Select CHANGE DISPLAY NAME from the menu. Enter your new name and then CONFIRM it by pressing OK.

Find the account you’d like to Unlink in the ACCOUNT LINKING section and click UNLINK. Check the Confirm box and continue by selecting FINISH.

Tap your name at the top of the main screen. Open your Player Profile by tapping the second tab. At the end of your Name, tap Edit. Enter a new Name and then Change it.

Open the Facebook app on your device. Go to Settings and then Applications & Websites. Then tap Call of Duty: Mobile, then Delete.