If you want a few dollars for your old cell phone, you might try selling it. There are a few sites that'll buy them, with prices all over the map.
For instance, a Nokia 3520 fetches $20 while my old 6160 is only going to get me $3.

http://www.oldcellphone.com
http://www.cashmyphone.com
http://www.cellforcash.com

There is another site www.SecondLifeCell.com that will pay you for your old cell phones. This site states you can "get paid in as few as 14 days", and has free shipping.

There is another option you can donate your old cell phone to various charities, who help out many different causes.

http://www.collectivegood.com/donate1.asp

I'm an IT person for our company and only use http://www.sellyouroldcellphone.com
to sell all my old phones to. They are the best as far as I am concerned.