Out of the 7.7 billion people on this planet, 5 billion use a cell phone. And still, so many of us don't know how we can make our gadgets serve us as long as they're designed to.  Is it ok to let the battery run completely out? Should you ever power your phone down? Should you take it out of your pocket before doing laundry? Here are some cellphone do’s and don’t’s to extend your favorite gadget's life to the max.

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