If you're wanting to exchange your old mobile phone for cash or shopping vouchers, I would definately recommend this website. They sent me a freepost package to post my phone to them and I received payment within a few days. They also kept me updated with texts- letting me know when they'd received my phone and issued payment. Thumbs up!
Website works well, shame the customer service is so weak - do not believe the initial price quoted, you won't receive it. Use one of the alternative companies offering this service and avoid this dishonest bunch of liars.