This guide shows you how to lock the Messages app (and any other app) on an iPhone running iOS 18, using the built-in Face ID or Touch ID requirement. You’ll also learn to hide app content from search and notifications for extra privacy. No extra apps or purchases are needed—everything is in Settings.
What You’ll Need
- An iPhone running iOS 18 or later (check in Settings > General > About).
- Face ID or Touch ID set up and working (Settings > Face ID & Passcode or Touch ID & Passcode).
- Your iPhone passcode (needed to confirm changes).
Step-by-Step
- Open Settings on your iPhone. It’s the gray gear icon on your home screen or in the App Library.
- Scroll down and tap “Apps.� This is the new app management menu in iOS 18, replacing the older per-app settings list.
- Find and tap “Messages.� You can scroll or use the search bar at the top. The list is alphabetical.
- Scroll down to the “Lockingâ€� section. It’s near the bottom, below notification and Siri options.
- Tap “Require Face ID� (or “Require Touch ID� on older models). A pop-up will appear asking you to confirm.
- Tap “Require Face IDâ€� again in the pop-up. This confirms you want to lock the app. You’ll be asked for your passcode to complete the action.
- Enter your passcode. After that, the Messages app is locked. The next time you (or anyone) opens it, Face ID/Touch ID will be required.
- Optional: Hide notifications. While still in the Messages settings, tap “Notifications,� then turn off “Allow Notifications� or set “Show Previews� to “Never� to prevent message content from appearing on the lock screen.
- Optional: Hide the app from search. In the same Messages settings, scroll to “Siri & Search� and toggle off “Show App in Search� and “Show Content in Search.� This prevents messages from showing up in Spotlight searches.
To lock any other app (e.g., WhatsApp, Notes, Photos), follow the same steps: Settings > Apps > [App Name] > Require Face ID/Touch ID. Not all apps support this—Apple only allows it for apps that have the “Lockingâ€� section in their settings. Third-party apps may have their own in-app lock options, but the iOS 18 method works for Apple’s built-in apps and many popular ones that have adopted the API.
Common Mistakes
- Looking for a “Lockâ€� toggle in the app itself. The lock is controlled in Settings, not inside the Messages app. You won’t find a lock icon there.
- Not updating to iOS 18. The “Appsâ€� menu and per-app locking are new in iOS 18. If you’re on iOS 17 or earlier, you won’t see these options.
- Turning off notifications but still seeing previews. You must also set “Show Previewsâ€� to “Neverâ€� or turn off “Allow Notificationsâ€� entirely—just disabling sounds isn’t enough.
- Forgetting that locking applies to the whole app. You can’t lock individual conversations or photos within Messages; the entire app is locked.
- Assuming the lock hides the app icon. The app remains visible on your home screen; locking only prevents opening it without authentication.
Tips
- Use a different Face ID appearance. If you share your phone with a family member, you can add their face to Face ID (Settings > Face ID & Passcode > Set Up an Alternative Appearance) and then lock apps—but that defeats the purpose. Instead, keep Face ID limited to you.
- Lock sensitive apps before handing your phone to someone. Even if you’re just showing a photo, the lock will prompt for Face ID when they try to open Messages.
- Combine with Screen Time. For more granular control, you can use Screen Time > App Limits to require a passcode after a time limit, but that’s not the same as locking—it’s a time limit, not a lock.
- Remember the lock is per-app. If you lock Messages, you still need to lock WhatsApp, Notes, etc., separately. There’s no “lock allâ€� toggle.
- Use the “Require Face IDâ€� option for Apple Pay too. That’s separate in Settings > Face ID & Passcode, but it’s a good security habit.
Troubleshooting
- You don’t see “Require Face IDâ€� in Messages settings. Make sure you’re on iOS 18 or later. Go to Settings > General > About and check the iOS version. If it’s older, update via Settings > General > Software Update.
- The lock asks for a passcode every time instead of Face ID. This happens if Face ID fails (e.g., you’re wearing a mask, or the sensor is blocked). You can also go to Settings > Face ID & Passcode and re-enroll your face if it’s not working.
- You locked an app and now can’t open it because you forgot your passcode. You’ll need to reset your passcode via recovery mode (connect to a computer and restore). This erases the phone, so always back up first. This is a last resort.
- The lock doesn’t apply to notifications. Locking the app only prevents opening it. Notifications still appear unless you turn them off or hide previews as described in Step 8.
- Third-party apps don’t have the “Require Face IDâ€� option. That’s normal. The app developer must support the iOS 18 locking API. If not, look for an in-app lock (e.g., WhatsApp has “App Lockâ€� in its own settings).
- After an iOS update, the lock disappeared. Rare, but possible. Re-apply the lock via Settings > Apps > Messages > Require Face ID.
Frequently Asked Questions
Does locking Messages prevent someone from seeing my messages in the notification center?
No, locking only prevents opening the app. You must also disable or hide notifications (Step 8) to keep message content off the lock screen.
Can I lock individual conversations within Messages?
No, iOS 18 only allows locking the entire app. There’s no per-conversation lock. For sensitive chats, consider using a third-party app that offers that feature.
Will the lock apply to Apple Watch notifications?
No, the lock is only for the iPhone app. Your Apple Watch may still show message notifications unless you turn off mirroring for Messages on the Watch app.
Can I unlock the app without Face ID, like with a passcode?
Yes, if Face ID fails (e.g., after a restart), you’ll be prompted to enter your iPhone passcode. That’s the fallback.
Does locking an app affect its background updates or notifications?
No, locking only requires authentication to open. Notifications and background sync continue to work normally.
Is there a way to lock the entire home screen or all apps at once?
No, iOS 18 doesn’t offer a global “lock all appsâ€� toggle. You must enable it per app. However, you can use Guided Access (Settings > Accessibility > Guided Access) to temporarily restrict access to a single app when handing your phone to someone.
Related
General steps for current mainstream versions; menus can differ by device and version. See the disclaimer or report an error.
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