Problem 1: Purchased an iPhone 5 in Aug 2013 through Carphone WH, having had an iPhone 4S for 1 day that I'd gotten direct from O2 but CWH had a better deal so they swapped it for an iPhone 5. Happy days for 2 years until nearing the end of my 2-year contract I literally had 6 phone calls PER DAY from CWH until I rang them to ask them to stop harrassing me. My husband's contract now also up and the phone calls have started for him too - seriously Carphone Warehouse, if a customer doesn't pick up after a few calls then TAKE THE HINT and get lost, it's nothing short of nuisance calls at this stage and we're thinking of reporting them. Problem 2: So I left O2 and went to another network after 2 years (not through CWH) and asked O2 for the unlock code to my phone. They argued the toss with me that they had NO record of me EVER having had an iPhone 5, but instead had the 4S that I'd had with them for 1 day. Carphonewarehouse hadn't updated their records or told O2 about the iPhone 5 so in effect I've been paying for an iPhone 4S with O2 and now they need more money from me to cover the cost of the 5 since I've left. SHOCKING customer service from Carphone Warehouse when I rang - admitted it was their fault but they couldn't do anything about it and since O2 don't recognise my iPhone 5 as my phone (but are happy to charge me for it I may add) I couldn't get an unlock code and had to take it down the high street and pay myself for it to be done. Unbelievable! Don't go through CWH, they will harrass you and not do their job properly.