Have used mobiles.co.uk for my last 2 upgrades at least. Always been so easy. Yet this time, after changing the colour of my selected iPhone 6s, the website changed my purchase to a new contract. I was unaware until I realised the phone had a new number after inserting the sim, by which time they will not accept the device back. Vodafone would of matched the price I thought I'd ordered... But seen as mobiles wouldn't let me return the device, I've had to pay more to alter it to a my upgrade. Therefore, I feel I have been mis sold, at the websites error, not mine, and they're weren't prepared to honour it. I won't be using them next time. Have now received my upgrade sim... But have checked the online store and u can still select phone colour and it changes to £39 from £44...