We typically think about cell phone service closing down either because of downed towers or massive overload during a disaster or an emergency. Broadcast stations as well as police and emergency services can also shutdown for similar reasons.
POWER OF COMMUNICATION OPTIONS
Those services are typically tied to a single approach for communication, however, amateur radio isn’t limited. Sure, on VHF/UHF a repeater might go down but that just means we need to go simplex. Or, amateur operators can readily set up a portable repeater system to get things going once more.