If you wish to change the mTan login procedure, you can enter a new mobile number here. With this login procedure, you will during the login procedure receive respectively via SMS a one-time code (mTan) that you can subsequently enter in the appropriate input field, thereby increasing your protection against unauthorized access.

Under this menu a change in the mobile telephone number can also be updated.

After clicking on "Next" a test SMS will be sent to this number, with which you can confirm your registration/update for mTan.