Open your Google Account page
Sign in to the account
Go to Security
Find Your devices
Select Manage all devices
Choose the phone you want to remove
Click Sign out
Confirm the action
If needed, change your password to remove access from the device
Open your Google Account page
Sign in to the account
Go to Security
Find Your devices
Select Manage all devices
Choose the phone you want to remove
Click Sign out
Confirm the action
If needed, change your password to remove access from the device