Motorola Razr M Doesn't Notify You When Text Messages Arrive

Problem: Your Motorola Razr M does NOT let you know when text messages arrive.

Solution: Hangouts → Settings → SMS → Uncheck "Turn on SMS"

Restart a Motorola Razr M

Problem: You need to force restart your Motorola Razr M, but unlike your other phones, you cannot access the battery to pull it out.

Solution: Hold down the power button & the down volume button at the same time, for about 10 seconds.