Hi Mail1959,
It sounds like you're having trouble with the sound on your iPhone, and I want to help.
Is it that you had poor sound quality on multiple devices? Is it that you can't hear people or is it that they can't hear you or both?
Is this only happening on phone calls? What happens if you FaceTime or record a Voice Memo?
Try some of the steps here:
If you can't hear a person on a call or voicemail or if the sound isn't clear on your iPhone - Apple Support
If the microphones on your iPhone, iPad, and iPod touch aren't working - Apple Support
Let me know if that helps.
Thanks for using the Apple Support Communities.