How to turn on hearing aid compatibility in the Google Phone App?

The hearing aid compatibility in the Google Phone App primarily involves T-mode (Telecoil). When enabled—provided the hearing aid supports T-mode and is switched to it—the device can receive call audio via the magnetic field generated by the mobile phone, rather than relying solely on the hearing aid's microphone to pick up sound.
To turn on hearing aid compatibility in the Google Phone App, please refer to the following steps:
1. Open the [Google Phone] App.
2. Tap the three-line icon in the upper-left corner.
3. Enter [Settings].
4. Go to [Accessibility].
5. Enable [Hearing aids].
Note:
1. "Hearing aid compatibility" does not mean the phone has a built-in hearing aid function.
2. The availability of this feature varies by device.