Donate it. Contact local charities to see what they'll accept. Three national programs to look at:
1. Cell Phones for Soldiers, (cellphonesforsoldiers.com)
Every phone provides an hour of talk time to soldiers overseas.
2. Hopeline, (verizonwireless.com/hopeline)
Phones can be provided to victims of domestic violence.
3. National Cristina Foundation, (cristina.org)
This organization finds customers for your castoffs among schools and charities in all US States, Canada, and internationally.
Donating your equipment will keep it from the landfills. More tips on electronics disposal coming soon.