My iPhone 7s
My phone icon has disappeared from my home screen. How can I restore it?
iPhone 7 Plus, iOS 15
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Top-ranking reply
Welcome to the Apple Support Communities.
You most likely moved it to the App Library. Go to the App Library (swipe to the last page on your Home Screen), and long press on the App's icon. You can then move it back to the Home Screen.
Organize the Home Screen and App Library on your iPhone - Apple Support
Jack