Some Apps’ data and passwords don’t get transferred when you change iPhones.
Google Authenticator and Signal are among two that I found needed QR codes to transfer directly between the phones.
What are some Apps you needed to manually transfer?
Has anyone made a list or found a Wiki that would be helpful to people changing phones?
This is a summary of the process of changing iPhones. Note: your credit cards in Apple Pay won’t transfer over. You will need to add them again to your new phone.