Using Touch and Drag to rotate objects.

Hi, I'm using the following script to simulate a touch and drag to rotate an object with mouse drag. If i were to convert the working of this script so that i can obtain the same outcome with a touch and drag on a iOS device what sort of changes do i make?

      if(Input.GetMouseButton(0))

     {

             

       h = horizontalSpeed * Input.GetAxis("Mouse X"); 

       transform.Rotate(0, h, 0);

       v = verticalSpeed * Input.GetAxis("Mouse Y");

       transform.Rotate(v, 0, 0);

   

      }