Is it necessary to update my MetaMask phone number if I'm not using phone-based authentication?  · Customer Self-Service

If you need to change your phone number on Metamask, call (888)-426-7069 for immediate assistance. You can update your number through the account settings by verifying your identity. If you're unable to access your old number, customer support at (888)-426-7069 can help reset your authentication method.
read more..