However, if you’re hard of hearing or deaf in one ear, you’re hearing only a portion of the sound in your hearing ear, which can be frustrating. When Mono Audio is turned on, you can set up iPhone to play all sounds in each ear.
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Tap the Settings icon on the Home screen.
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Tap General and then scroll down and tap Accessibility.
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In the Accessibility pane, scroll down and tap the Mono Audio On/Off button to turn on the feature.
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Tap and drag the slider to L for sending sound to only your left ear or R for right ear.
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Tap the Home button to close Settings.
If you have hearing challenges, another good feature that iPhone provides is support for closed-captioning. In the video player, you can use the closed-captioning feature to provide onscreen text representing dialogue and actions in a movie (if it supports closed-captioning) as it plays.