Hello there, Virginia.
It seems you were referred to us from the very article that has a few pointers on troubleshooting the issue you're describing with your bluetooth enabled hearing aids.
iOS: Troubleshooting Bluetooth connections
If after following the initial troubleshooting steps recommended in that article you find that the issue persists, there are some additional steps you may try here:
- Move your iOS device closer to the Bluetooth accessory.
- Position your iOS device and Bluetooth accessory in direct line of sight of each other. For example, move the Bluetooth accessory and iOS device to the same side of your body.
- Remove any case, stand, or other accessories from your iOS device and see if performance improves.
- Check for sources of potential interference and move both the iOS device and the Bluetooth accessory away from other electronic devices.
- Reset network settings by tapping Settings > General > Reset > Reset Network Settings.
This will reset all network settings including: previously connected Wi-Fi networks and passwords, recently used Bluetooth accessories, VPN, and APN settings.
If the steps above have not resolved the Bluetooth behavior you are experiencing, perform a software restore in iTunes.
If the issue persists after restoring your iOS device in iTunes,contact Apple for support and service options.
I also found some informative information in this article as well, in regards to hearing aid compatibility:
iPhone: Hearing Aid Compatibility (HAC)
Thanks for reaching out to Apple Support Communities.
Cheers,
Pedro.