Like all of Apple’s built-in iOS apps, the Calendar app is out there for a free re-download on the App Store. So first, let’s open the App Store.
With the App Store open, tap the search bar at the top of the screen and type “calendar,” then tap “Search.” In the search results, you might see some apps that aren’t the official app you’re looking for. To make sure it’s the real thing, tap on the icon or name listing for the Calendar app.
To download the Calendar app, click the iCloud download button.
Tip: If you see an “Open” button rather than the iCloud download button here, meaning that Calendar is already installed on your iPhone. within the future, you would possibly got to use Spotlight to quickly find and launch it.
The app will download to your device, and counting on your settings, you’ll either find it on your Home screen or in your App Library.
If you would like to revive the other built-in iPhone apps, you’ll get them an equivalent way as shown above. But better of all, you’ll always know what day it’s because of Calendar being back in its proper place.