# Change Phone Number Guide
**Step 1**: Log in to the Single Sign-On account management page: . In the account management function menu, select the "**Change Phone Number**" option.
**Step 2:** Enter the phone number you want to change to. Then, click "**Send OTP**" to receive the OTP code from the email you have registered.
Our system will send you an email titled "**GreenNode - OTP Update Phone Number.**" Copy the OTP code from the email and paste it into the "**Enter OTP**" field.
**Step 3:** Enter the security code and click "**Save Settings**" to save the new phone number. You will receive a notification along with a successful phone number change email, similar to the image.
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