Choose the preview and lock-screen policy you actually want, then verify it on the locked phone and connected displays.
To keep messages private on a locked phone, change what notifications reveal, not just how loudly they arrive. You may be able to keep an alert while hiding its text, or remove that app’s lock-screen notification entirely. The available choices depend on the phone and app.
Test the result while the phone is genuinely locked. A setting that looks right on an unlocked screen does not prove what another person can see when the phone is on a table. Connected watches and other displays need their own review.
Choose what you still want to see
Decide whether you need the app name, the sender, the message text or only a signal that something arrived. These reveal different amounts. A notification without message text can still expose the name of a sensitive app or the fact that someone contacted you.
Start with the apps that show personal conversations, appointments or account information. Review them individually rather than blocking every alert and later missing something useful. A calendar reminder may matter while a promotional shopping message does not.
Apple’s notification settings guide documents preview choices including Always, When Unlocked and Never, where supported. These control previews; they should not be confused with a promise that all notification-related information is hidden.
Separate quiet settings from privacy settings
Silent mode controls sound. A focus or quiet mode changes interruptions according to its settings. Neither automatically means message text cannot appear on a screen. Check the actual lock-screen and preview options instead of relying on the absence of a noise.
On Android, Google’s notification guide describes options for lock-screen notifications and sensitive content, with paths that vary by phone. Some arrangements let you restrict particular apps as well as choosing an overall policy.
| Your aim | Setting to examine | Result to check |
|---|---|---|
| Hear fewer interruptions | Sound or quiet mode | Whether an alert still displays text |
| Keep an alert, hide its contents | Preview or sensitive-content controls | What remains visible while locked |
| Hide a sensitive app’s alerts | That app’s lock-screen display options | Whether its name or sender still appears |
| Protect a connected watch | The watch’s notification privacy controls | Its own locked and unlocked display |
Menu wording differs between models and versions. Use the device manufacturer’s current instructions if the controls do not match. Do not reset all notifications merely because one app’s option moved.
Review the app as well as the phone
Some apps have their own notification controls, such as which message categories generate alerts. Those can work alongside the phone’s display rules. Review both if a message type still appears after you changed the main setting.
Check useful exceptions deliberately. A phone used for on-call work, care responsibilities or important reminders may need a careful balance. Test the alerts you rely on after changing settings. This guide does not recommend turning off emergency alerts or treating ordinary app settings as a replacement for those systems.
Also consider information already visible in widgets or other lock-screen features. Hiding a message preview does not automatically hide a calendar widget. Choose which information belongs on the locked display and use the relevant feature’s own controls.
Remember the watch on your wrist
A phone and watch do not always show notifications in the same way. Apple’s watch notification guide describes both mirrored and custom app settings, a tap-to-show-full-notification control and a separate option for summaries while locked.
If you use another wearable, read its manufacturer’s instructions. Do not assume a phone preview setting governs every paired accessory. Use a harmless message to check the actual watch rather than forwarding a private conversation as a test.
Consider nearby computer or tablet sessions too. If the same messaging account is open there, its notifications are another display to review. The useful boundary is every place that can reveal the message, not only the phone in your hand.
Run a simple test without private content
- Choose a harmless test message, such as “notification test”.
- Apply the intended preview or lock-screen setting.
- Lock the phone normally and avoid unlocking it through face or fingerprint recognition during the check.
- Have a trusted person send the test, or use another account you control.
- Inspect the phone and any connected watch.
- Unlock deliberately and check the normal message-reading route still works.
Do not post screenshots of real messages in public support forums. If a setting fails, record the model, software version, app and the kind of information still visible. The test text can stay fictional and unimportant.
A fictional desk-privacy adjustment
Imagine fictional reader Lee leaves a phone beside a shared workspace. The phone makes no sound, but messages still appear in full. Lee changes the preview setting, checks a harmless locked-screen message and notices the watch still reveals more detail.
After changing the watch’s supported privacy controls too, Lee repeats the check. A useful alert remains, while reading the message requires the intended interaction. Lee also checks that an important reminder still arrives. This illustrates a review process rather than a performed product test.
Before recording or sharing a screen, use our screen privacy checklist; locked-phone settings do not govern every recording situation. For a family album, our private photo-sharing guide covers who can access the content itself.
If a support session asks you to expose messages, our remote support checks help you limit what is shared. Your next step is one harmless locked-screen test of the app whose messages you most want to keep private.
Sources and verification
Editorial review 2026-10-18. Source check dates are recorded separately. Notes describe what each source supports and its limits.
View sources
- Apple: Change notification settings on iPhoneChecked Preview choices, individual-app controls and separate screen-sharing notification settings.
Limits: Not all apps support previews; controls vary with system version. - Google: Control notifications on AndroidChecked Lock-screen and sensitive-content choices can differ from sound and app-specific notification settings.
Limits: Phone manufacturers and versions differ; no universal path or sensitive-content detection guarantee. - Apple: Notifications on your Apple WatchChecked Mirrored/custom notification controls, tap-to-show details and locked summary controls.
Limits: Apple Watch-specific; other wearables require their own documentation.