I bought a Pay As You GO handset from Carphone warehouse in Dec,2013. It was with Orange network. Pay as you go customers are allowed to upgrade after 6 months of buying their product subject to fulfill the requirements. In this regard, 2 months ago when I contacted with Carphone warehouse customer service, I was told that the number which I gave them was not a valid number. Whereas the sim and set both were sent by Carphone warehouse. Then I went to the High Street shop of CPW to justify this one. I got the same message. Later, I showed the receipt as sent by CPW to justify it. I was told to contact Orange customer service to rectify it. When I contacted Orange network, they said it was a valid number adding that CPW system is wrong. Even Orange offered to upgrade with them. But their product was out of my range. That's why I did not go through. When I contacted CPW for last time, I was given the same message. Since then I decided not to buy any product from CPW. Rather I preferred to buy online from Ebay. Last week when I relate this matter with one of my friends, he told me that he had the same experience as I had. So the Pay As You Go customers, please be careful from them.