One main thing that is harvested from old cell phones and pagers are their vibrating motors. These little wonders can be used for all kinds of projects!
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Really wat sort of thing can u do with the vibration motor
This is a pretty good example: http://www.youtube.com/watch?v=rUSTXUis_ys
Use it as an emergency only phone to use with the American Roaming Network where you can make calls for $3/minute or just for calling 911. You need to program the number from what it presently is to 123-456-7890.
Donate it- There are several organizations that take old cell phones to use as emergency 911 dialers for homeless and needy people. Another option is one of my favorites here at Instructables, the Decepticon phone.