Not the best price but a damn side quicker and easier than ebay
From posting (I printed out the label myself) to money in my account in 34 hours! OK - I got £150 and would have got more from an auction site, but this was much easier, and having bought a new phone outright I needed the cash back for the old one fairly quickly. Happy to recommend them, but if you want to maximise your cash and can stand the hassle, try eBay.
To reply as a company, please log in to your business account.