Live Listen for iPhone and iPad is fantastic. It not only works with Made for iPhone hearing aids, but also with Apple Bluetooth headphones like AirPods. When using Live Listen, the iPhone/iPad volume control buttons increase the gain for the microphone, making everything louder, so make sure you adjust that if you’re having trouble hearing when using that feature before turning up the Microphone Levels on the hearing devices page. Take a look at this page for more information.
Mike