We can enable Hearing Aid Compatibility (HAC) in the phone app settings on the OnePlus smartphone, which ensures that audio from the device being played is compatible with standard hearing aids.

Note: To find out which hearing aids support compatibility or are certified, please contact the manufacturer.

Android 10 | OxygenOS 10.0
Hearing aids -  Open the  Phone app
Hearing aids -  Open the  menu
Hearing aids -  Open the  Settings
Hearing aids -  Tap on  Accessibility
Hearing aids -  Enable or disable  Hearing aids
  1. Open the Phone app
  2. Open the menu
  3. Open the Settings
  4. Tap on Accessibility
  5. Enable or disable Hearing aids

OnePlus Instructions