we have problems at work with cw. customers will go in, and buy a 02 payg sim+phone,+presume its the same as it would be everywhere else, when in fact they usually buy the phone from obscure countries, and simply mate a sim with it.(thats why you can often get phones in cw, when they havnt even been released by the actual network yet) Therefore, sometimes, the phone isnt able to accept all the correct settings. Try explaining that to a customer,lol.