The 911 system was designed to provide a universal, easy-to-remember number for people to reach police, fire or emergency medical assistance from any phone in any location, without having to look up specific phone numbers. You can use 911 system text option when there is a dangerous situation which requires you to be silent. The deaf and hard-of-hearing have the same option to use the 911 system text service.
Read more: Calling 911: What You Need to Know Kid's Educational Coloring and Activity Books