For the security reason, you must reverify your phone number and, add a new phone number. please follow the instruction below:
1. Click "Account" in My page.
2. Go to "Security" tab and click the "Expand" button in Manage verifications > Mobile phone verification.
3. Then, click "Verify a new mobile phone number" and, reverify your mobile phone number.
4. Once, you completely verified your mobile phone number, please complete the "verify a new mobile phone number".
※ Change mobile phone number is available only on DAYBIT Web.