How to Boot a Android device in Safe Mode

If you’re experiencing frequent crashing,
freezing, or battery life issues, on your android device you can
boot into safe mode and see if the
issues still happen there.

In safe mode, Android won’t load
any third-party applications.
This allows you to troubleshoot your device.
From safe
mode, you can uninstall misbehaving
third-party apps.

How to Boot in Safe Mode:
To reboot into safe mode in Android 4.1
or later, long-press the power button
until the power options menu appears.
Long-press the Power Off option and
you’ll be asked if you want to reboot
your Android device into safe mode.
Tap the OK button.

On older versions of Android, long-press
the power button and then tap Power Off
to turn off the device.
Turn on the
phone or tablet by long-pressing the
power button again. Release the power
button and, when you see a logo appear
during boot-up, hold down both the
Volume Up and Volume Down buttons.
Continue holding the two buttons until
the device boots up with a Safe mode
indicator at the bottom-left corner of its
screen.

In safe mode all the apps you have manually installed will not load so you can find the application which is causing you the trouble, try uninstalling the recently installed app and see if problem persists.
You can exit the safe mode by simply turning off your device normally and restarting.

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