How to remove a Google account from your Android phone
Open your phone’s Settings app. Tap Accounts. If you don’t see Accounts, tap Users & accounts or Passwords & Accounts. The wording all depends on what model of phone you have.
Tap the account you want to remove.
Tap Remove account at the bottom of the screen. You will be asked to confirm your choice. Confirm, and the account will be removed.
Please note that if this is the only Google account on your phone, you’ll need to enter your phone’s pattern, PIN, or password for security. Your phone will also lose some functionality — for example, Chrome browser sync — until you connect to at least one other Google account.
How to remove a Google account from your iPhone
Go to Settings and open the settings for either Mail, Contacts, or Calendars.
On the next page, you will see a section called Accounts. Tap on it.
You will now see the accounts on your phone. Tap the one you want to remove.
Tap Delete Account at the bottom.
How to remove a Google account from your Samsung Galaxy phone
Tap Settings > Accounts and backup.
Select Manage Accounts.
Tap the Google account you want to delete.
Select and confirm your action by tapping Remove Account.
FAQs
Go to the Device Activity section of your Google account. Ensure you are signed in under the correct Google account registered to that device. The Device Activity page will show you all of your registered devices. Choose the one you want to remove, and on the next page, select Sign out.