If you have already configured 2FA for your ICONOMI account, you can choose to switch between delivery applications/devices at any time.
If you know you're changing phones, it's usually very easy to change which application/device you use for authentication—you just need to make sure you do it before you change your phone. You'll install an app on your new device, scan a barcode or enter a code from ICONOMI, and confirm that you're in possession of the device.
You can then swap applications in your ICONOMI account settings.
Change 2FA: Login > Account > Change Two-factor Authentication settings > Change 2FA application/device > Follow the on-screen instructions