The microphone is a great use case for AirPods. People are talking more on their AirPods these days than they do via their phones. The microphone on the Pro is still very good for picking up human voices. The most important frequencies of the human voice are between 100Hz to 3000Hz. The AirPods Pro does an excellent job of not de-emphasizing and over-emphasizing any part of this frequency range. These are not perfect neutral, so there will be some differences, but you should have no problems talking on the phone.