When you see the Motorola logo, press and hold the Volume Down button.
Hold it until you see "Safe Mode" in the lower left corner of the screen. Press the Menu button and then turn the phone back on.
If that doesn't work, or your phone won't start up all the way, then move on to the instructions below.
For the Samsung Galaxy S3 and Galaxy Tab tablets, turn off the gadget (hold the power button, tap "Power off" and then tap OK).
Hold the Menu button until "Safe Mode" appears in the lower-left corner.
When you're done with Safe Mode: Turn off the phone and turn it back on.
When the second HTC logo shows up on the screen, press and hold both the Volume Down button and the "Optical joystick," which is the circle button near the bottom of the phone's front.
The thing is, modern smartphones and tablets are basically mini computers, and they can crash and freeze as well. Android's safe mode loads up just enough to get Android running so you can remove problem apps or change settings.
It might be you downloaded a bad app or changed the wrong setting. Of course, getting to Safe Mode on Android isn't as easy as some might wish.
Wait a few seconds and then turn the gadget back on.
When you see the Samsung logo, press and hold the Volume Down button until Safe Mode shows up in the lower-left corner of the screen.
When you're done with Safe Mode: Turn off the gadget completely and turn it back on.