Cellphone users in the United Kingdom now have a more envrionmentally-friendly means of disposing of old cellphones, thanks to a new service from Envirofone that'll give you cash for trading them in. To get rid of your phone you just check Envirofone's website to see what they'll give you for it and then drop it in the mail. The company will even provide as many pre-paid envelopes as you need if you've got a huge stash of handsets. The phones are then re-distributed to places around the world where they can be re-used or are otherwise recycled. No word on if the program will be expanded outside the U.K anytime soon.