crwdns2934241:0crwdne2934241:0 David Keldsen

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Josh's answer is excellent; there's an even simpler failure that sometimes happens.  Try putting in headphones and pulling them out again.  Sometimes dust etc. gets wedged in the contacts of the headphone jack and causes the phone not to go back into the 'handset mode.'  Putting headphones in a time or two will sometimes fix this, and it's a useful diagnostic in any case.

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