HD Voice (high-definition voice) is the new audio technology that noticeably improves speech reproduction quality on the smartphone and largely eliminates background noise, particularly in a loud environment (such as train, street).
You can make phone calls even when in a loud environment and can still clearly understand the person you are talking to. The background noise is reduced to a minimum and thus allows for a relaxed conversation.
The feeling that you are talking face to face with the person at the other end is significantly increased.
Delicate issues can now also be discussed over the phone as the audio quality allows for the equally flawless transmission of quietly spoken or whispered words. You can talk quietly – without anyone listening in.