I had come to the end of a 2-year contract and wished to upgrade from iPhone 4s to iPhone 5s with a different contract package so i went to Carphone Warehouse at Cribs Causeway, Bristol. The customer Service i received was nothing short of disgraceful but with my goal in mind got my new iPhone 5s which I left the shop with but is required an immediate upgrade in operating system which should have happened before i left the shop intact the phone should have been setup to my personal requirements whilst i was with them - when i got home nothing worked and i was forced to go back to the shop where they uploaded the operating system - silly me left with my new mobile again and once I had got in the comfort of my own home decided to set my phone up.......yet again nothing worked so the next day i returned the phone and cancelled the contract which took in the order of 45 minutes or so once they had said i couldn't cancel the contract and return the mobile. I told them that I had cancelled the direct debit from my bank and eventually left the shop with a receipt for the returned handset and a small amount of money returned but i then had to spend yet more of my time cancelling the upgraded contract with O2 which I can say was far from plain sailing! My advice, pay a little more and go to another supplier and give Carphone Warehouse a wide berth. I am now going to write to the CEO to vent my disgust but I will probably be ignored!!