How do I get my phone app back it got accidentally deleted
How do I get a deleted shortcut back that is a preloaded one
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you can't delete the Phone app, so you must have 'Removed' it. In which case, it's still in the App Library
From your Home Screen, swipe left until you get to the App Library.
Swipe downward and you'll get an alphabetical list of your apps.
Locate the app in the list or type the app name into the search field
Once you've located the app, tap/hold, then drag it and it'll pop out to your Home Screen
Organize the Home Screen and App Library on your iPhone - Apple Support
If you deleted a shortcut and are trying to get that back, you'll probably need to go into the Shortcuts app, locate the shortcut, tap share, then add to Home Screen