Q: Reselling iPhones/iPads/Macs

For any resellers like local shops, or any person that is selling a phone to a friend, family member, or online, please make sure that Activation Lock is OFF prior to reselling devices.

Check if Activation Lock is enabled - Check Activation Lock Status - iCloud

About Find My Device - Find My iPhone Activation Lock - Apple Support

What to do before selling your Apple device - What to do before selling or giving away your iPhone, iPad, or iPod touch - Apple Support