Hi sorry - been out for a walk and a paper!
You can do it in branch and I am sure you can do it at an ATM so you should be able to do it over the phone?
Once you log-in and accept your picture confirmation you get this screen:
Kullan-at! SMS-OTP
To complete your transaction, enter the Kullan-at! OTP that we will send to your mobile phone on the next screen.
You can update your Mobile Telephone number in our system from one of our branches.
You can't see it here on my copy and paste but the box is in the
middle - here
Kullan-at! OTP Mobile phone number to which the PIN is to be sent