When you are logging in on a new device, we will be asking you for the verification code sent to your phone number. This is know as the 2FA=2 Factor authentication, and it add an extra layer of security for your account.
If you are going to use the new device to log in to your Konto.com account frequently, then, you can tick the “Trust this device” box. This will link the new device to the list of trusted devices.