If you are unable to hear any audio from your device, please make sure that your Bluetooth settings are turned off and that you are not connected to any external audio speakers. 

Here is a helpful article on how to turn off your Apple iOS device's Bluetooth: https://www.lifewire.com/how-to-turn-off-bluetooth-on-phones-4171879

If this does not solve your problem, first verify that your Apple device can play audio from another app. Try opening your Safari web browser and going to YouTube. Pick any video and try to play it. If you can hear audio from this video source but can't hear SAMi Audio, then please complete our technical support form here: https://hipass.zendesk.com/hc/en-us/requests/new