If you want extra security for your device, especially when using it in public, then this app is the key. 

Using the Battery Charge Lock: Phone Sec app keeps your phone secure when charging it in public spaces. The app's built-in feature has an unstoppable alarm that will sound whenever an unknown person tries to steal the device. When you set your phone's screen lock, thieves cannot interrupt it.

To use the app, if you set an alarm, it will continue to ring even if someone else restarts your phone. The only way for the alert to stop is by you. Whatever they may do, even if they plug in again after unplugging once, the phone will ring.

Hence, this app is a must-have. Charging your phone in public spaces no longer need to worry you.