was running iphone 11 Pro, got an ok upgrade deal and iphone 15 pro arrived. The setup was very easy UNTIL... first thing it did was update to iOS 17.0.3 which apparently helps with "hot iphone" issue. But I stumbled into 3d-party bug during setup: I had added NFC yubi keys to two factor authentication for my AppleID account earlier this year, which worked great on 11, but it borked the last phase of setup on 15.
Something did not transfer over from 11 to 15 re yubikey and I was locked out of my AppleID account. Was on phone with Apple Senior tech for 75 min. We finally worked around it by deleting the yubikeys from the AppleID account using the settings on the 11. What is "interesting" the overall setup process had reached a stage where it had already suggested erasing the 11.
I thought that was premature, and sure enough, if I had done that erasure, I might have been forever locked out of decade+ of iphone data. I knew just enough tech to avoid that disaster (by not erasing the 11). Apple asserts it has ZERO responsibility for yubikey snafu's. Something to aware of. I assume I am not the only one who used yubikey with iphone...