Phone Features for Hearing, Built In and Free

Modern phones include a substantial set of hearing-related features, developed for accessibility and useful well beyond it. They cost nothing and are almost entirely undiscovered.

Sound amplification

Both major platforms include a feature that turns the phone into an assistive listening device: the microphone picks up sound, processes it, and delivers it to wired or wireless earphones with amplification and frequency shaping.

On Android, it is Sound Amplifier, available in Accessibility settings. It offers separate boost and fine-tuning for each ear, background noise reduction, and can process either live microphone input or media playing on the device.

On iOS, Live Listen sends the microphone to compatible earphones. Headphone Accommodations applies a personalised frequency profile, configurable from an audiogram if you have one, or through a built-in listening test.

Practical uses: hearing someone across a noisy restaurant by placing the phone nearer them, following a lecture from the back of a room, or watching television at a volume that suits everyone else.

It is not a hearing aid and does not replace assessment by an audiologist. It is genuinely useful for mild difficulty and for temporarily noisy situations.

Live captions

Android's Live Caption captions any audio playing on the device — video, podcasts, voice messages, calls — automatically and on the device, with no connection required.

Enable it in Settings, Accessibility, Live Caption. Once on, a caption box appears whenever audio plays. The volume buttons offer a toggle.

It works on anything, including content with no captions of its own, and it works offline.

iOS has Live Captions with similar behaviour, available in Accessibility settings on supported devices.

Beyond accessibility: watching a video in a quiet room, following speech in a noisy one, or reading a voice message you cannot listen to.

Live transcription

Android's Live Transcribe transcribes speech around you in real time on the screen, in many languages, with sound event notifications for things like a doorbell or an alarm.

Useful for conversations, and worth knowing about for anyone supporting a relative who is losing their hearing.

Hearing aid connectivity

Both platforms support direct connection of compatible hearing aids over Bluetooth, allowing calls and media to stream directly to the aids, with volume and programme control from the phone.

Android supports hearing aid streaming natively on recent versions. iOS has long supported Made for iPhone hearing aids.

The newer Bluetooth audio standard, LE Audio, includes a broadcast capability intended for public venues, which is gradually appearing in devices and in places like theatres and stations.

If you or a family member wears hearing aids, checking whether they pair directly with the phone is worth doing — it changes the experience of phone calls substantially.

Audio balance and mono

Accessibility settings on both platforms include:

Left and right balance, for asymmetric hearing.

Mono audio, which sends both channels to both ears. Essential for anyone using one earphone or with hearing in one ear, and it prevents missing content mixed to one side.

Volume limits and hearing protection

Both platforms can cap headphone volume and warn about cumulative exposure.

iOS tracks headphone audio levels in the Health app and reports exposure over time.

Android offers a similar warning at high volumes.

This is worth enabling for teenagers in particular, where the exposure is highest and the consequences arrive decades later.

Other useful settings nearby

Flash notifications — the camera flash or screen flashes for calls and alerts. Useful when the phone is silent or when a ringtone is not audible.

Vibration intensity adjustment, separately for ringtone and notifications.

Real-time text during calls, on supported carriers, which allows typing during a voice call.

Sound notifications on Android, which alerts you when the phone detects specific sounds — a smoke alarm, a doorbell, a baby crying, running water.

Where to find all of this

Android: Settings, Accessibility. The hearing section groups most of it.

iOS: Settings, Accessibility, then the Hearing section.

Both platforms allow an accessibility shortcut — a triple-press of the side button, or a floating button — that toggles a chosen feature instantly. Setting this up for whichever feature you use most makes it practical rather than something buried in menus.

Worth doing for someone else

If you have an older relative struggling in conversation, spending twenty minutes setting up sound amplification and live captions on their phone is likely to be more immediately useful than anything else on their device. Neither costs anything, and neither requires admitting to a hearing problem before trying it.

Mistakes people make

Not knowing these exist. Sound amplification, live captions and live transcription are built in, free, and almost entirely undiscovered.

Waiting for a diagnosis. These features are useful for mild difficulty and for noisy rooms, and trying them requires admitting nothing to anyone.

Treating amplification as a hearing aid. It is genuinely useful and it is not a substitute for assessment by an audiologist.

Not setting the accessibility shortcut. A feature buried three menus deep will not be used. A triple-press of the side button makes it practical.

Overlooking hearing aid pairing. Direct Bluetooth streaming to compatible aids transforms phone calls, and many wearers do not know their aids support it.

The short answer

Android: Settings, Accessibility, then Sound Amplifier and Live Caption. iOS: Settings, Accessibility, Hearing, then Live Listen and Headphone Accommodations. Set the accessibility shortcut so the feature is one press away.