I know they piggy-back on Sprint, and I know they don't have the greatest service or the best phones but, for $35 a month it's pretty great. If we could get more people on board with lower cost carriers that would be a good way to send them a message.
You can get an Android phone for less that $100, plans start at $35 for 300 minutes, unlimited data/text. Data gets throttled after 2.5GB. They piggybank on Sprint's network. I've had it for nearly two years and can't really complain.
or recycle them. take them to a center that takes computers. if you're not in portland, oregon there are still a list of recycling resources at the freegeek site.