HiI am using a Vodafone sim on a factory unlocked iPhone 4. I am successfully able to activate facetime (in the process an international sms is sent).But the problem is that when I switch off the phone the facetime seems to get deactivated and when I switch the phone again I need to activate it again (and thus another international sms needs to be sent).Anyone has a similar problem? Or is this because I am not on an official carrier (Airtel or Aircel)?CheersA