code: func (r User_Customer_MobileDevice) GetOperatingSystem() (resp datatypes.User_Customer_MobileDevice_OperatingSystem, err error) {
  	err = r.Session.DoRequest("SoftLayer_User_Customer_MobileDevice", "getOperatingSystem", nil, &r.Options, &resp)
  	return
  }
docs: // Retrieve The operating system this device is using