HD voice calling makes voice calls crystal clear, adds video calling for some

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HD Voice comes in many different names but is available on most cellphone carriers.  I tested it out on Verizon but T-Mobile, AT&T and Sprint also offering it.  You will have to have a phone that is compatible and will need to be calling someone on the same carrier.  For now, it doesn't work between different cell carriers.

Verizon Phones compatible with HD Voice

Sprint Phones compatible with HD Voice

at&t Phones compatible with HD Voice

T-Mobile doesn't offer a list but you can check each phone's specs for HD Voice support