Factory resetting an iPhone before selling it

Order matters here: 1. Back it up (iCloud or computer) if you want anything off it. 2. Unpair your Apple Watch first if you have one. 3. Settings, tap your name, Sign Out. This is the important one, it switches off Find My and Activation Lock. Skip it and the buyer gets a phone that asks for YOUR Apple ID and won't set up. 4. Settings > General > Transfer or Reset iPhone > Erase All Content and Settings. 5. Take the SIM out, or delete the eSIM when the erase asks. Afterwards check the phone is gone from the device list in your Apple account. If it reaches the hello screen and asks nothing about your account, it's ready to hand over.