Daughter brought a iPhone on o2 from car phone warehouse as a xmas present 2 years ago. This xmas Carphone warehouse sent me texts saying it was time to upgrade. As I did not want to upgrade I ignored them and assumed the o2 monthly bill would drop back to a Sim only tariff. Wrong! The text did not say that if you did not upgrade then you carry on paying the same amount, even though the phone had been paid for so now I have lost £125, which o2 or Carphone warehouse will not give back. My wife, who did her contract direct with o2 had her contract drop back to a sim only contract without problem. Do not bother with them and go directly to the network provider.