Go to your control panel, section " Account Settings ": [cp.cstyhost.ua – Settings – Accounts] [cp.cityhost.ua – Settings – Accounts]
In the "Basic data" block, click on the "Change phone" button:
In the drop-down menu, enter the code from the SMS and click on the "Delete phone" button:
PLEASE NOTE: after clicking on the button to change the phone number, an SMS will be sent to your current phone number with a confirmation code for this operation, after which you will have the opportunity to delete the current phone number and add a new one.