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
Step 1:  Open the  Phone app
Step 2:  Open the  menu
Step 3:  Open the  Settings
Step 4:  Tap on  Accessibility
Step 5:  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