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For iPhone users, iOS 5 includes custom vibrations as part of its accessibility feature set. It allows you to tap and create a custom vibration pattern for those who are visually impaired to determine who is calling or sending a message -- or simply to know who is calling without even looking at your iPhone. It also features an LED blinker to notify when a message has come through. Very useful for migrating BlackBerry users.
(Image source: TiPb)