When an Android device locks up, and does not respond to holding down the power button, is there anything you can do to reboot the device besides removing the battery?
What do you do if the battery is not removable?
Although it does not always work, Windows has the three finger salute (Ctrl+Alt+Delete) which helps get around this situation. Is there anything similar in Android?
I did find this question, but it does not refer to a device that is frozen.