If you have Made for iPhone hearing devices you can set these up through the ‘Hearing Devices’ settings (Fig 2).
Made for iPhone hearing devices have been designed and certified to work with iPhone, iPad and iPod Touch giving users access to many advanced settings that aren’t available to standard Bluetooth hearing device.
For instructions on connecting your Made for iPhone hearing device and a guide to their special features, see the Apple help article: https://support.apple.com/en-gb/HT201466
A list of all the compatible Made for iPhone hearing devices is available at the bottom of the webpage linked above.
Note: Standard Bluetooth hearing devices can be connected to your device using the usual Bluetooth pairing method: Open settings (Fig 1, above) > tap on Bluetooth > tap the Bluetooth on/off toggle if it isn’t already on > select your hearing aid from the list of devices to pair it (you may need to set your device to ‘Bluetooth pairing’).
If your iPhone has an LED flash (normally used by the camera) you can set it to flash when a notification is received. Once enabled, this feature is activated whenever the device is laid face down on a flat surface.
Mono audio means that the left and right earphones play exactly the same audio, without any stereo effect. This can be useful if you have better hearing in one ear than the other as the same sound is sent to both earphones.
To make phone conversations easier to hear when you are in an environment with background noise you can enable ‘Phone Noise Cancellation’. This will reduce the amount of background noise the phone picks up.
You can adjust the audio balance so that the sound you hear is shifted to the left or right speaker, hearing aid or headphone. This can be particularly useful when combined with ‘Mono Audio’ (see above).
When enabled and available, ‘Closed captions and SDH’ (Subtitles for the Deaf and Hard of hearing) offer a text alternative during video playback.
You can see a preview of the style at the top of the screen. (Fig 12). Note: you can see a full-screen preview by tapping on the ‘full-screen arrows’, circled in Fig 12.
When happy with your settings, either tap the back button in the top left of the screen to return to the main ‘Accessibility’ settings screen or press your device’s ‘Home’ button to return to the home screen.