Hidden Intruder Selfie is a free Android app developed by MasterApps Solution that helps you identify who tries to unlock your phone. This app captures a photo using the front camera of your phone when someone tries to unlock it and fails. You can get a notification alert, save and share the intruder photo with your friends. Additionally, you can hide the picture from the gallery so no one can see it. Hidden Intruder Selfie works 24/7 as a phone guard, making it a reliable security app.

The app has many useful features, such as adding the time and date to the photo for a better idea, setting photo capture count, setting maximum wrong attempt count, showing notifications, setting photo storage limits, setting a counter for the old photo that automatically deletes and saves storage space, and sharing photos on social media. To use the app, simply install it, give necessary permissions when asked, and set the options according to your preference in the app settings. To uninstall, you need to remove the "Device Administrator" permission first. Keep in mind that the app uses Device Administrator permission to detect failed attempts, and the Android system detects failed attempts only if the password has a minimum of 4 characters or pin has a minimum of 4 letters or the pattern has a minimum of 4 points long.