My cell phone/pda is almost a year old - or in other words, a paleolithic fossil. When it's time to send it to the big cell tower in the sky (no, not the one outside your window, the big fluffy one that all good cell phones go to) I'll mail it back to the manufacturer - just like the last one and the one before that.

Cell phones in particular and electronics in general are a major source of toxic waste. Of course since all old computers are used to crunch for WCG, they aren't so much of a problem

Check out this article on e-waste from cell phones.
Cell Phones Qualify As Hazardous Waste