Android 7.1 Nougat secretly adding new security features. This feature is called the panic mode. However it is not a button that can summon police when its users in danger. But, this key is created so that users can return to the home display whenher cell phone got the malware.
Android users are often stricken with malware (malicious ware) that hijack the display of their mobile phone. The screen display with hijacked. The user is not able to use the back button to return to the main screen. This security feature can even remove malicious applications (malicious).
Some malware may make the back button and other buttons do not function. This feature will run automatically when a user repeatedly pressing the back button on their cell phones.
Google will monitor how much the back button is pressed repeatedly. This is theirmarker that the user being freaked out because of the difficulty to return to the main menu or switch to another application. That is why this feature is called panicmode.
By looking at the frequency and how much the back button is pressed, this modewill reactivate the back function is locked by the malware. So back to the main menu, immediately do a safeguard. Uninstall the malicious application that makes your cell phone is not behaving normally, such as written BGR