Open your Google Account
Go to Security
Select Your devices
Choose the phone you want to remove
Click Sign out
Confirm the action
If needed, go to Find My Device
Select the phone
Choose Remove device
If the phone is listed under 2-Step Verification, go to Security
Select 2-Step Verification
Remove the phone from your verification methods
If the phone is listed under Recovery phone, go to Personal info
Select Phone
Remove or update the recovery number
If the phone is synced in Gmail, Contacts, or Drive, remove the account from the phone itself
On the phone, go to Settings
Open Accounts or Passwords and accounts
Select your Google account
Tap Remove account