You will need to be registered for our online service, myaccounts, to use the mobile app.
You will need your myaccounts online service username, password, and one time passcode (sent via SMS) to log in to the app for the first time.
If you have not registered for myaccounts, you can register here to get your username, password, memorable word by email and your verification code by post, which will enable you to login to the mobile app.