Don't use the free postal service, it's not a safe package to send mail, even if the shop says its fine. My phone is lost and O2 don't do anything to help. In fact there are many other good companies that offer a much better service with secure free postal. Another bad service by 02!!!!
It's been over 4 weeks and the O2 shop said it would be fine and just to post it. What they didn't say is that they could have taken it off me and posted it as I have just found. It was only £40, but the overall service was very poor, in the shops and over the phone. Anyhow, I shouldnt have to pay for a postal service which is free with other recycle companies. Lesson learnt, don't use 02.