Can I add a prepaid line to my postpaid account?

Hola @sydchalla You wouldn't be able to add a prepaid line to your postpaid account, but you can add a regular line to your existing account or create a new prepaid account. It would be worthwhile to take a look at the cost difference for those two options. If you do create a prepaid account and are currently using a physical sim card for your postpaid account, I don't see why you couldn't activate your prepaid number on your esim profile. That is the great thing about the new dual sim capabilities of these new phones. 

Hope this helps!