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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.
40 secret iphone features and shortcuts (When I get an iPhone) - pretty cool. I new most of them from just digging around to see how it worked, but some of the others were enough to make me actually like my phone. My hubby will be happy to hear that. ;)