Swipe down from the top-left corner of the screen to open Notification Center
Swipe up on the lock screen to view older notifications
Check notifications directly on the lock screen
Open the app that sent the notification to see in-app alerts
Go to Settings
Tap Notifications
Select an app to view its notification settings and recent alert options
Use Search by swiping down on the Home Screen and typing the app name or related alert
Check Focus mode settings if notifications are not appearing
Review Notification Center for grouped notifications from the same app