Open the Settings app on your iPhone
Tap Accessibility
Tap Hearing Devices
Make sure Bluetooth is turned on
Open your hearing aid battery doors or place the hearing aids in pairing mode
Wait for your hearing aids to appear under MFi Hearing Devices
Tap your hearing aids name
Tap Pair when prompted
If you have two hearing aids, pair the second one when prompted
Wait for the connection to complete
Adjust hearing aid settings in Control Center or Accessibility if needed