You will then be expecting them. A safe peek at the peephole will verify their arrival. Use the peephole so outsiders cannot see the movement and know you are home. If you identify the person by using the peephole you can then talk through the door. A phone with a long cord can be taken into the bedrooms at night or the bathrooms during showers and baths.
Outsiders only have to listen at the bathroom window to know someone is using the facilities.
That may offer them an entrance opportunity. They may unintentionally mention this information to their acquaintances who may want your hard earned money. It may be repeated to a potential home invader. That gives an opportunity to assess your possibly valuable possessions and the layout of your house. Keeping a dog is also a good way to teach children a sense of responsibility.