The app works perfectly on the Iphone and I can dispense food from anywhere and receive fault messages

You need to connect the device to WiFi. Once that's done, you can use the app with any internet connection.

Yes, it also works outside the wifi. I can generally recommend the system

I can't give any information about functionality on the Iphone. But I can only agree with @mdobler when it comes to dispensing food on the move. This works perfectly. Messages such as low feed or replace desiccant etc. also work.