If your device is too old or damaged to sell, don't just chuck it into the trash can, recycle it. Most governments offer local options for electronics recycling. Check in your area for schedules and drop off locations. Recycling keeps dangerous chemicals out of landfills and saves natural resources by cutting down on mining and minimizing pollution resulting from manufacturing. (Recycle any batteries separately.)
Many electronics manufacturers also have mail-in and drop-off recycling programs for their old devices, including Apple, Samsung and Sony. Wireless carriers will take old flip phones at no cost.
Head to the nearest Best Buy and they will take electronics off your hands for free. In-person drop offs are also available at Office Depot and Staples, though sometimes a small fee will be charged to cover the cost of processing.