Hi Compcat38,
Thank you for contacting Apple Support Communities. Based on what you stated, it seems like there is trouble hearing people or voicemails on the iPhone. It looks like you have already done some troubleshooting to solve this issue. Even though there is a chance that you've tried these steps already, I would recommend you follow every step and let us know if the issue persists.
- Restart your iPhone and test again.
- If there's still no sound or poor sound quality, update your iPhone to the latest version of iOS.
If you tried these steps and there's still no sound or poor sound quality from your iPhone, contact Apple Support."
If you can't hear a person on a call or voicemail or if the sound isn't clear on your iPhone
Please don't hesitate to let us know if the steps resolved your issue or if you need additional assistance.
Cheers.