Having checked around, RPC offered the best price for my iPhone, so I sent it off to them and quickly got an email back from them saying that the phone met their 'full working and grading criteria' and that I'd get a 'confirmation of payment' email within 24 hours. A week later - no email and no money, so I rang them, and got a very helpful guy who said he didn't know what had gone wrong, but that he'd sort it out for me. Another week later ... nothing. So I rang again, no one answered the phone - panic setting in! But next day I tried again and got straight through to a guy called Barry, who said that he'd talk to his manager and get the payment authorised asap. And he did - the payment came through within a couple of hours, and Barry actually rang me back to check that everything was ok. Conclusion - it all worked out in the end, but there was a lot of hassle and worry along the way :-(