System: Android 4.2.2 (Jelly Bean) with Anti-Theft (ROOTed) 3.0.7118.
When I lock the phone remotely, the appearing pop-up window (for the unlocking action with avast pin) never disappears. This will drain the battery very quickly on the lost/stolen phone. This is a serious problem: I do not dare to use the ‘Lock’ feature.
But is your phone set to keep screen always on? Otherwise, won’t the screen shutdown automatically? Where would be, in this case, the battery drain?
• My phone is actually set to turn off the screen after 30 seconds of inactivity, and behaves in that manner: the screen turns off after 30 seconds on inactivity. But there is a single exception: When I lock the phone remotely from the avast anti-theft web interface, the display is turning on with that pop-up window (for the unlocking action with avast pin), and that window never, never dissappears. The screen remains turned on „forever”, until I enter the pin code or manually turn off the screen with power button. Consequently: if the phone is lost or stolen and I lock the phone remotely from the avast anti-theft web interface, and no one turns off the display of the phone, the turned on display will drain the battery quickly. This is a serious bug.
• Comparison: Android Device Manager and Cerberus don’t even turn on the screen when I lock the phone remotely.
• Another issue: the AVAST-style unlock window uncovers (unmask) for the thief the fact that the stolen phone is followed remotely. Android Device Manager and Cerberus uses the system’s lockscreen, so they don’t unmask the fact of the interaction. (Ok, I know: Cerberus migrated to /system cannot unlock a hard reseted phone as long as the Cerberus is not enabled once again to be a device adminiostrator, and that is another issue in the case of Cerberus.)