Why can't I hear the vibration of other people's phone calls when I'm listening to a novel?

Usually, when we listen to novels, we focus on the story and the development of the characters and ignore the surrounding environment. Therefore, we are unlikely to notice the vibration when someone is talking on the phone. In addition, most mobile phones used earphones or hands-free devices to make calls instead of answering them directly. These devices would usually block out the surrounding sounds, including vibrations. Therefore, we wouldn't notice the vibration when someone was talking on the phone. However, if you use the direct answer method when making a call and the surrounding environment is very noisy, you may still be affected.