Shut the phone all the way down.
Hold the "Home" button and the volume up button at the same time then also hold the power button. Yes, all three at once.
When you see itty bitty blue text at the top of the screen, you can let it all go. It usually appears right at the first vibrate.
Use the volume up/down keys to select "wipe cache partition". Tap the power button.
Once that's done, select "reboot system now". Tap power button.
Phone will reboot as normal.
Depending on how much you use your phone, you'll want to do this at least once a month, more if you are a high user. You can do this to all Android phones and tablets. Do a full power off at least once a week, more if you are adding/deleting apps.
Apnea Board Moderator
Breathe deeply and count to zen.