Use Home on iPhone to control smart home accessories such as lights, locks, security cameras, and thermostats.
Sign in with your Apple ID - Apple Support
Organize the Home Screen and App Library on your iPhone - Apple
See who has access to your iPhone or iPad - Apple Support
HomeKit: Everything You Need to Know - MacRumors
Set up iPhone - Official Apple Support
Send email in Mail on iPhone - Apple Support (IS)
Use the compass on iPhone - Apple Support
Home app - Apple
Share control of your home - Apple Support
About Assistive Access on iPhone - Apple Support
Use the side, Home, and other buttons on your iPhone - Apple Support
If the Restore screen appears on your iPhone, iPad, or iPod touch
Browse the web using Safari on iPhone - Apple Support