Screen Lock Number Briefcase is an Android application developed by shamsi apps, falling under the Utilities & Tools category. This app is a code number lock screen that works like a briefcase lock in real life. Users can set and change number combinations according to their choice, providing screen security as well as entertainment. The application uses the Device Administrator permission, as well as Phone, Device & Call information permission to help with screen lock functionalities and constraints.

The lock screen number pattern is classical with a nice graphical combination, and the lock screen keyguard will protect the change pattern page from other users. The app is a unique idea with respect to other lock screen apps, and is free for a limited time. However, it is important to note that this application uses sensitive functionality of the device, including the Device ID & Call Information permission, which will only be used to listen to incoming calls to unlock the screen and lock the screen when the call is finished.