On a few occasions Android users have found their phone in Safe node. You can tell if the phone is in Safe mode by the ‘Safe mode’ watermark on the screen normally in the bottom left corner of the screen and no third-party applications present on phone. So what does this mean?
Safe mode is normally triggered by an error or bug in a previously installed application that may hinder the system to run with it installed. In this case the phone will reboot itself in this mode that only allows system applications to run and all third-party applications installed disabled. In Safe mode a user can’t access any third-party application. The phone temporarily reverts itself to factory settings in the very state you got it before installing any other application.
Safe mode can also be used as a diagnostic state to know if a particular bug in the phone is caused by a third-party application or the intense battery drainage and overall slow performance  is caused by third-party applications. Users can boot into Safe mode by Holding the Power button and Holding the Power Off option. This normally presents an option to boot into Safe Mode.
To boot out of Safe mode, a similar thing can be done and some phones like Samsung and HTC have an indicator within the status drop-down menu that shows the phone is in Safe mode, and by tapping it, a user will be asked whether boot out of Safe mode or not. If for some reason the phone is boots right back into Safe mode despite trying to boot out of Safe mode, you will most likely have to reset the phone via recovery which wipes all installed third-party applications.
