If your doorbell currently doesn't work, we strongly advise you to stick a note on your entrance door and/or portal, indicating that the bell is out of service and asking visitors to knock instead.
If you live in an apartment complex in which directly accessing your door is not possible, please make sure to indicate in detail how to enter your building (building, door code, floor, apartment number...).
Regardless of your housing situation, we can't stress enough how important indicating a contact number is. However, please remember that these tips are provided for information purposes and that we cannot guarantee that the carrier will call the number indicated.