On the supported iPhone you can preview content on the lock screen when there is an incoming notification such as SMS, Messenger.
However, this feature sometimes makes users dissatisfied because it may reveal personal information. Here's how to hide the content of messages on the lock screen on iPhone :
Step 1: Install.
Step 2: Notice.
Step 3: Show preview.
Step 4: Choose when to unlock or not.
Or you can choose each app to set up hidden notification content for the app you want:
Step 1: Select the apps you want to set up.
Step 2: Show preview.
Step 3: Select Select when it is unlocked or not.
So you've done successfully hide notification content applicable to iOS 11 .
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