This article applies to: Android

Certo Mobile Security’s Intruder Detection feature helps you catch someone trying to access your device without your permission. You can choose from various detection and alert options. Instructions for each are described below:


Tip: Deactivate Intruder Detection using the On/Off switch at the top before changing your detection method or action. You cannot make changes while Intruder Detection is running.


Detect when your device is moved and take a secret photo of the intruder*

Set this before leaving your device anywhere unattended (e.g. your bedside table at night, your desk at work or in a locker) to catch snoopers in the act.

Setting Up

  1. Launch Certo Mobile Security and tap ‘Intruder Detection’.
  2. Tap ‘Movement’, then tap ‘Take Photo’. Grant the app permission to use the camera, if prompted.
  3. Tap the ‘On/Off’ switch at the top.
  4. You will now have 10 seconds to place your device on a flat surface before motion detection starts.
  5. When instructed at the end of the countdown, carefully lock your device.
  6. The app will now continually check for motion and will take a secret photo using your device’s front camera the next time it is moved. Once motion is detected and the photo is taken, Intruder Detection will switch off automatically.

Viewing Captured Photos

  1. Unlock your phone and return to the Intruder Detection page in Certo Mobile Security.
  2. Tap ‘View Photos’.
  3. Captured photos are displayed.
  4. Tap a photo to view the date/time it was taken. You can also delete photos, if required.

* Movement detection may result in increased battery usage. We recommend connecting your device to a power source when using this feature.


Detect when your device is moved and sound a loud alarm*

Set this before leaving your device anywhere unattended (e.g. your bedside table at night, your desk at work or in a locker) to alert you that it has been moved and to ward off intruders.

Setting Up

  1. Launch Certo Mobile Security and tap ‘Intruder Detection’.
  2. Tap ‘Movement’, then tap ‘Sound Alarm’.
  3. Tap the ‘On/Off’ switch at the top.
  4. You will now have 10 seconds to place your device on a flat surface before motion detection starts.
  5. When instructed at the end of the countdown, carefully lock your device.
  6. The app will now continually check for motion and will sound a loud alarm the next time your device is moved. Once motion is detected and the alarm starts, Intruder Detection will switch off automatically but the alarm will keep playing.

Stopping The Alarm

  1. Unlock your phone and return to the Intruder Detection page in Certo Mobile Security.
  2. Tap ‘Stop Alarm’ on the alert that appears.

* Movement detection may result in increased battery usage. We recommend connecting your device to a power source when using this feature.


Detect someone trying to guess your PIN and take a secret photo of the intruder

If your PIN is incorrectly entered 3 times, a secret photo will be taken of the intruder.

Setting Up

  1. Launch Certo Mobile Security and tap ‘Intruder Detection’.
  2. Tap ‘Incorrect PIN’, then tap ‘Take Photo’. Grant the app permission to monitor unlock attempts and to use the camera, if prompted.
  3. Tap the ‘On/Off’ switch at the top.
  4. Lock your device.
  5. The app will now continually monitor for incorrect PIN entries. If your PIN is entered incorrectly 3 times in a row*, the app will take a secret photo using your device’s front camera.
  6. Intruder Detection will continue to monitor for incorrect PIN entries until you switch it off.

Viewing Captured Photos

  1. Unlock your phone and return to the Intruder Detection page in Certo Mobile Security.
  2. Tap ‘View Photos’.
  3. Captured photos are displayed.
  4. Tap a photo to view the date/time it was taken. You can also delete photos, if required.

* The Android system defines a valid PIN number as 4 digits or more, therefore any attempts containing less than 4 digits will not be counted.


Detect someone trying to guess your PIN and sound a loud alarm

If your PIN is incorrectly entered 3 times, an alarm will sound to alert you and to ward off the intruder.

Setting Up

  1. Launch Certo Mobile Security and tap ‘Intruder Detection’.
  2. Tap ‘Incorrect PIN’, then tap ‘Sound Alarm’. Grant the app permission to monitor unlock attempts, if prompted.
  3. Tap the ‘On/Off’ switch at the top.
  4. Lock your device.
  5. The app will now continually monitor for incorrect PIN entries. If your PIN is entered incorrectly 3 times in a row*, a loud alarm will sound.
  6. Intruder Detection will continue to monitor for incorrect PIN entries until you switch it off.

Stopping The Alarm

  1. Unlock your phone and return to the Intruder Detection page in Certo Mobile Security.
  2. Tap ‘Stop Alarm’ on the alert that appears.

* The Android system defines a valid PIN number as 4 digits or more, therefore any attempts containing less than 4 digits will not be counted.