Do not use them, slow and ignorant.
The price which they initially offered for my phone was the highest out of all mobile trading sites, so once I received the Free post envelope which was prompt, I headed over to my local post office and sent it. After a week, I knew they would of received it however I had no confirmation emails. After many emails there were still no reply and no answer when I phoned them. I decided to check out the reviews and they were terrible, people were saying that no matter what condition you send the phone in, even if it is literally brand new, they always deduct the price they offer you. Basically they lure you in with a great price before offering significantly less then you expected. Feeling that I have been scammed, I continued to contact them warning them with legal action and surprise they finally replied. I then received an email saying they had received my phone but had deducted £5 from it due to general wear and tear. My phone did have many scratches admittedly so I wasn't to fussed as £30 was still a good price compared to other websites, plus I just wanted my money after waiting ages for it. I accepted the offer and received another email saying that my payment which I asked to be completed via Bank Transfer should done during 48 hours from now. I had a feeling that it wouldn't which would result in me having to contact them however a day later the money was in my bank. Thank god, I knew if I did not constantly message them that they would have never sent my money and claimed never to have received my phone. Many people who have used these have most likely been scammed so I warn you not to use these and go with trustworthy ones like Mazuma.