To use the Continuity Camera mounts in this guide, your iPhone needs to be running iOS 16 or later; to be capable of running Continuity Camera; and to support the use of MagSafe mounts.
So the full list as of May 2024 is:
• iPhone 12, 12 Mini, 12 Pro, 12 Pro Max
• iPhone 13, 13 Mini, 13 Pro, 13 Pro Max
• iPhone 14, 14 Plus, 14 Pro, 14 Pro Max
• iPhone 15, 15 Plus, 15 Pro, 15 Pro Max
Some older iPhones are able to run Continuity Camera, but do not support MagSafe mounts, so you would also need to buy a MagSafe-compatible phone case:
• iPhone XR, XS, XS Max
• iPhone 11, 11 Pro
• iPhone SE (2020 or later)