After being held in a long queue the advisor took a long time to deal with my request to upgrade to an iphone 5c, and he called me back and requested more information that he did not ask in our first call. I told him I was staying with O2 so that I could keep my current phone number and change my current rolling contract with them smoothly. He told me this was not a problem and I needed to wait for the phone to arrive before I call O2 and request the sim swap to keep the same number. When I tried to do the sim swap on-line, the message said that my serial number was already used, and after 2 hours of talking to various departments at O2, I was told that I now had 2 separate contracts running with them, and that Carphone Warehouse had allocated a new number to my new phone, so it was more complicated to keep my current number. O2 are now arranging for this to happen but it takes longer and I then wasted more time cancelling my original contract, which Carphone Warehouse should have done.