Declared my phone fake
In my experience I would avoid this company and use one of the better known competitors.
Whilst Mobile Phone Xchange offered a fair price and cashback (hence me risking using them), on receipt of my phone they declared it fake and refused to pay out.
My phone was purchased directly from the manufacturer, for which I have the receipt, the phone and serial number are registered on the manufacturers website and the phone had the correct IMEI. It was not a fake, and they gave no justification for declaring it so.
Mobile Phone Xchange will now go on to sell on my legitimate phone and make a profit, whereas I have nothing to show for it.