Phone with the best voice quality - easy to understand what people are saying

[Android Central Question]

Looking for a new phone with good voice quality. For example when I talk to people in their cars or when they have me on speaker phone or just have a poor phone, I have a hard time understanding what they are saying. Are there any phones with good speaker and maybe some filters to help clean up poor quality voice? Any price range just looking for the best voice quality.

Also any carriers better than others for this?

I currently use an old G'Z One on Verizon.