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iPhone users: Do you find yourself typing the same thing a million times a day? Go to Settings > General > Keyboard and look for Shortcuts after you scroll down just a bit. Then just enter the phrase and appropriate shortcut, and the next time you type that shortcut the phrase will appear. This is particularly handy for things like BRB or your email address.
That LED in the back of your iPhone isn’t handy for just taking pictures in the dark, it can also be used for a notifying beacon, similar to the LED on most BlackBerry phones. Go to Settings > General > Accessibility and turn on the slider for LED Flash for Alerts, and the next time something comes in, the LED will flash accordingly.