I have sold a phone to them. I got the full quoted price, they paid for postage, envelopes etc. no complaints at all. I would say tho, be honest re the condition of your phone cos they do say they might give you less if it isnt as you described.
Do not sell your phone to Envirophone, there are very rude and refused to send my phone back when i refused their offer!
AVOID AVOID AVOID!
also compared to other websites their offers are very low
:-(