Cut off from news and from help, a household plans blind and waits alone. Signal is the thread back to the outside — and it runs in three directions at once. The first tier, the phone, you already have; the honest plan assumes it is the first thing to fail, and builds the resilient tier beneath it.
A simple battery or wind-up radio to catch news, weather and official word — the cheapest, most important comms you own. Knowing beats guessing.
Handheld radios keep a household or neighbourhood coordinated when the network is down; a satellite messenger reaches out when nothing else can. This is the tier that survives the crisis.
A whistle on every lanyard, an air horn to muster, a flare pack, and a registered 406 MHz beacon — ways to be located that need no tower, no charge, no signal.