What should I do if I stay in a hotel and don't let the phone ring

There are two ways to avoid disturbing hotel rooms. One is to find the Do Not Disturb switch in the room, which is usually located at the bedside. Press it, and the Do Not Disturb light outside the door will come on. The "Do Not Disturb" light is usually red, which means the red light stops. Another way is to have a sign on the back of the door handle, and the front and back sides are "Please clean immediately" and "Do not disturb" respectively. Just hang the "Do Not Disturb" side on the door handle outside the door.