Two Step Verification vs two factor authentication
I am trying to add an old iphone 4 back onto my account but although i can login to the device i dont believe two factor authentication works on IOS 7- my other devices give me a passcode but I am not prompted on the Iphone 4. I can't switch my Icloud account back from two factor authentication to two step verification. Whats the workaround?
iPhone 4 (8GB)