The voice on the other end of the phone seems to have been changed by a transducer. It's eccentric. It's not clear whether it's a man or a woman.
The shrill "buzz" echoes in his ears, making William even more irritable.
"Who the hell are you? Why do you know my private cell phone?
The person on the other end of the phone gave a light "ha" and said, "Who am I? You don't need to know. You just need to know that the person you are holding is not the one you can afford. "Page" is not the person he can provoke? Ha, joke!
Since William had the courage...