To change the mobile phone number that is used in two-step verification by SMS:
In Kaspersky Security Center Cloud Console, click the link containing your account name, and then select Manage user account.
The My Profile window of the Kaspersky Account portal opens.
If two-step verification is disabled, enable the Two-step verification is disabled toggle switch.
Under Phone number, click the Change phone number link.
Under Enter your phone number, specify the new mobile phone number that you want to use in two-step verification, and then click the Provide phone number button.
A 6-digit security code is sent to the specified phone number.
Under Enter the verification code that was sent to <phone number>, enter the received security code.
Your mobile phone number is changed. Now, one-time security codes will be sent to the new phone number.