Cerberus Lock Screen Protector

Cerberus • LSDroid srl

About this app

😔 Some device models, like Google Pixel, Nothing phone and others, do not provide an option to protect the quick settings or the shutdown menu with a password, so a thief could swipe down from the lock screen and disable the internet connection, put the phone in airplane mode or shut it down, rendering any anti-theft protection or device locator app useless.

💡 With this app you can avoid that: you can disable access to the pull down menu (quick settings, control center) from the lock screen and also block the power off menu, requiring the password to power off. If your phone gets stolen you will still be able to locate and track it!

🙏 This app is completely free and has no ads, yet if you want to have a complete protection for your phone, yourself and your loved ones you can subscribe to the Cerberus suite (Cerberus Anti-theft, Cerberus Personal Safety and Cerberus Kids Safety).

😲 Cerberus Anti-theft gives you other great features to help you recover a lost or stolen device, like providing a fake power off menu (fake shutdown) to fool thieves in thinking they have shut down the phone, while it stays active and traceable.

This app uses Device Administration to turn off the screen and lock it when the power off menu or quick settings are being displayed.

This app uses Accessibility Service to monitor the lock screen and block the power off menu and quick settings. It does not collect or send any information.

Ratings and reviews

I thought this would fix another problem, but now I see the difference between the Quick Setting drop-down panel and the Quick Control Page that comes up over the lock screen when the phone is sitting in the Pixel Stand and recharging. So I found a fix for the Quick Control screen elsewhere, and have a more favorable rating and experience with this Lock Screen Protector, which I've wanted to stop previously and now I can. No more accidentally changing settings while phone locked!

I love the idea of the app. But when the shutdown / restart menu appears, there is a small moment in which, if the thief is fast enough, he can press the shutdown button. On the other hand. I don't use the option to block the quick access buttons, I just want to block the change of state of the network, I don't want to block all the buttons on my lock screen. I preferred to hide the tile that controls the network connection and to continue using the other quick access. Thanks✌🏻

Odd that there are no reviews? Anyways good app. I did notice there is sometimes an up to 1 second delay when swiping down the quick shortcuts menu before it blocks you. I have been able to quickly toggle Bluetooth or autorotate during that delay. A quick-fingered thief, I could imagine, might still be able to hit airplane mode (I don't keep a shortcut to that) or turn internet off if they are a very quick shot. The app also does not stop holding power button for 10s from restarting the phone.

What’s new

Improved user onboarding
Fixed quick settings block on Android 16 QPR1 beta
Fix shutdown menu and quick settings block on OnePlus devices with OxygenOS 15
Small bug fixes and performance improvements