title: Track whether iPhone user dialled USSD code
body: <p>I am working on a app which requires call forwarding. As we know we can't dial USSD code programmatically in iOS, can we track whether a user dialled USSD code through iPhone or if possible, Is der a way to check whether SIM is used to dial USSD code?</p>
  
  <p>Update1: M nt trying to call ussd programmatically but want to check whether user dialled it or not.For example, if we call USSD codes manually, can we check any logs or any class object variable which can help in finding out whether user dialled a specific USSD code </p>