Most smartphone users focus on strong passwords, biometric logins, and software updates. Those are important security habits, but many people overlook a surprisingly common privacy risk: the always-on display (AOD) feature.
Many Android smartphones and some other devices show the time, date, battery status, and notifications on the screen even when the phone is locked. While that convenience can save a few taps, it can also expose sensitive information to anyone nearby.
If you're looking for a simple way to strengthen your mobile security today, turning off your phone's always-on display or limiting notification previews is a smart place to start.
What is an always-on display?
An always-on display is a feature that keeps a portion of your screen active while the device remains locked. Depending on your settings, it may show:
- Text messages
- Email notifications
- Calendar reminders
- Authentication codes
- Social media alerts
- Banking app notifications
The feature is designed for convenience, but convenience and privacy don't always go hand in hand.
Why can an always-on display be a security risk?
The biggest risk is information exposure.
The U.S. National Institute of Standards and Technology (NIST) specifically warns that sensitive information contained in notifications may be displayed even when a mobile device is locked, allowing someone with physical proximity to gain unauthorized access to that information through lock screen notifications.
Think about everyday situations:
- Sitting in a crowded coffee shop
- Waiting at an airport gate
- Working in a shared office
- Leaving your phone on a restaurant table
- Charging your device during a meeting
In each scenario, someone nearby may be able to view information without ever touching your phone.
What kind of information could be exposed?
Many users assume lock screens only show notification icons. In reality, devices can display much more depending on configuration.
Sensitive information commonly exposed includes:
- One-time verification codes
- Password reset notifications
- Email subjects
- Meeting details
- Delivery notifications containing addresses
- Financial transaction alerts
- Personal text message previews
Even small details can help cybercriminals conduct phishing attacks or social engineering scams.
How does this help someone become safer online?
Cybersecurity is often about reducing the amount of information available to attackers.
When you hide notification content or disable your always-on display:
- Fewer personal details are visible to strangers
- Sensitive account information stays private
- Verification codes are less likely to be exposed
- Social engineering attacks become harder
- You gain greater control over your personal data
In other words, you reduce opportunities for criminals to gather information about you.
What should you do instead?
You don't have to eliminate convenience completely.
A better approach is to limit what appears on your lock screen.
Recommended security settings
Consider making these changes:
- Turn off the always-on display entirely
- Hide notification previews on the lock screen
- Show notification icons only
- Require biometric authentication before displaying message content
- Disable lock screen visibility for banking and financial apps
- Hide email previews while the device is locked
These small adjustments can dramatically improve your privacy without affecting everyday usability.
How to turn off always-on display
The exact steps vary by manufacturer, but generally:
On Android devices
- Open Settings
- Tap Display or Lock Screen
- Select Always-On Display
- Toggle the feature Off
On Samsung Galaxy devices
- Open Settings
- Tap Lock Screen and AOD
- Select Always On Display
- Turn the feature Off
Review notification privacy settings
While you're updating security settings, also:
- Open Settings
- Select Notifications
- Tap Lock Screen Notifications
- Choose Hide Sensitive Content or Show Icons Only
This provides a balance between awareness and privacy.
Additional smartphone privacy tips
For even stronger protection:
- Enable automatic software updates
- Use a strong PIN alongside biometrics
- Install apps only from trusted sources
- Remove unused applications
- Turn on Find My Device capabilities
- Review app permissions regularly
The National Institute of Standards and Technology's mobile security guidance emphasizes the importance of securing mobile devices because they routinely store and access sensitive personal and business information.
Final takeaway
Turning off your phone's always-on display may seem like a small change, but it can have a meaningful impact on your privacy. Every notification preview, authentication code, and message snippet visible on a locked screen represents information that others may see.
By disabling the always-on display or limiting lock screen notification content, you make it harder for strangers, scammers, and opportunistic attackers to gather information about you. It's one of the quickest mobile security improvements you can make today, and it's a simple step toward a safer digital life.
