Earlier this week several states experienced disruptions with their 911 emergency call center networks.
https://www.foxnews.com/us/widespread-911-outages-reported-least-states-officials-say
I did some independent checking and found out temporary disruptions to the 911 phone system are much more common than I would have imagined and that last year several Indiana counties had short (1-6 hour) service outages but because they were brief and often in areas with relatively low population density, they did not receive statewide or national attention.
The 911 system is completely separate from “regular” phone system to law enforcement and emergency services so if one goes down the other is likely to still be functional. In addition, about 9% of the United States does not have 911 service and must rely on “regular” phone numbers to call police or emergency services (fire, ambulance, etc.).
It is a good habit to look up the regular phine numbers for emergency services where you live and work and put those numbers in your phone just in case you ever need assistance quickly and the 911 system is down. It is also a good idea to find and store those numbers for wherever you are traveling on business or vacation.