To Update in Zoho Accounts:
- To access Zoho Accounts, you can:
- go to the Zoho Accounts website or;
- from Zoho People Home Dashboard, click on your Photo found on the top right, then click on My Account.
- Under the Multi-Factor Authentication tab found on the left side bar, go to MFA Modes under SMS-based OTP, then click + Add Number.

- Input your latest mobile number, then click Add.

- Wait for a text message from your phone to input the one-time password (OTP) for verification, then click Add.
- Once successful, click on View N more number/s.

- Hover on your latest phone number, click on Set as Preferred Number, then click on Confirm.


- To delete your old phone number, click on View N more number/s and hover on it again, then click on Delete.

Important Note:
SMS-based OTP Multi-Factor Authentication (MFA) cannot be disabled as it is part of the Security Policies.