Images Checking the device is ipad or iPhone in univercial application

Below method is the utility method to check whether device is ipad or iphone while devloping universial application.Which works in even IOS 3.0

+(BOOL)isDeviceAniPad
{
        #ifdef UI_USER_INTERFACE_IDIOM()
              return UI_USER_INTERFACE_IDIOM();
        #else
            return NO;
      #endif
}