iOS 16 Real-Time Call Transcription Guide

Apple introduced real-time call transcription in iOS 16 through an accessibility feature called Live Captions, designed to convert spoken audio into on-screen text instantly. This article outlines how Live Captions supports users during phone and FaceTime calls, examines the on-device processing that protects user privacy, and provides straightforward steps to activate and use the feature on compatible iPhone models.

How Real-Time Transcription Works in iOS 16

In iOS 16, the Live Captions feature transcribes spoken dialogue dynamically during live phone calls. When active, a small, adjustable window floats on the screen displaying a running text transcript of what the person on the other end of the line is saying. The transcription updates continuously as the caller speaks, allowing users who are deaf, hard of hearing, or in noisy environments to follow conversations without relying solely on audio.

The feature also integrates with "Type to Speak," enabling users to type out responses that the device then speaks aloud to the caller using a synthesized voice. This provides a complete two-way text-to-speech and speech-to-text communication channel directly within standard phone calls.

Key Benefits During Phone Calls

  • Accessibility: Empowers deaf or hard-of-hearing individuals to participate in regular cellular and VoIP phone calls without needing specialized third-party relay services.
  • Noisy Environment Utility: Allows any user to read what is being said when audio playback is difficult to hear or when using headphones is not an option.
  • Call Review: Gives immediate visual confirmation of important details such as addresses, phone numbers, and dates while the conversation is taking place.

On-Device Processing and Privacy

Live Captions in iOS 16 runs entirely on the iPhone using the device's Neural Engine. The audio from phone calls is never uploaded to Apple servers or processed in the cloud. This architecture ensures that sensitive conversations, personal data, and business calls remain private and encrypted on the local hardware.

How to Enable Live Captions on iOS 16

To turn on real-time call transcription:

  1. Open the Settings app on an iPhone running iOS 16 (iPhone 11 or newer).
  2. Tap Accessibility.
  3. Scroll down to the Hearing section and select Live Captions.
  4. Toggle Live Captions to the on position.
  5. Tap In-App Live Captions to ensure the transcription window appears inside the Phone and FaceTime apps.

Once configured, the transcription box appears automatically when a call begins, or it can be accessed quickly by setting up the Accessibility Shortcut (triple-clicking the side button).