What are the alternative communication system during various disasters?

Question

plzz give me the site link

or the list of ways

Answer 1

Alternative to say radio or telephone, cell-phone, etc...

Messenger on foot

Signal fire, smoke signal

Vehicle horn, headlights, emergency flasher

Flashlight, torch

Heliograph

Whistle (on a personal floatation device)

Signal/distress Flare

EPRB (Emergency Position-Indicating Radio Beacon)

Bang on the pipes, wall, floor, ceiling

Shout (Yahoo!)

Answer 2

Ross covered it pretty well...but he forgot ham radio

Here in Florida, about this time each year, we start getting prepared for hurricane season...the authorities remind us that, in a disaster, the regular telephone system will be first to go down, then the cell phone system will almost certainly fail.  Official communications like police and fire radios are often installed on cell towers, so they could fail too.

That's why hams (amateur radio operators) stay ready to provide service.