ecoATM - "The ecoATM is an automated, consumer self-serve kiosk"
, you can find in some malls around US.
Get instant money for your used, old, phone or mp3 players (perhaps other electronics too).
Some good info on these kiosks is on MNN website
It would be good to know what do these guys do once they get all these used or old phones??
Further research showed that all these go into environmentally responsible recycling and / or to secondary world markets. See http://hothardware.com