SirRoxalot said:
The time required to dial a large number of cell phones is considerably greater than getting a message out using radio, particularly if EAS is activated. And, the detail and immediacy of the message necessarily suffers. Less than 50% of subscribers have data-capable phones. Cell phones may work for a relatively small area, but their effectiveness declines as the area and/or number of recipients rises.
Radio still has greater potential to reach the masses with timely information. Cell phone's best use would be to advise people to turn on the radio for further information.
Again, if we look into the immense urban legend that is the Minot chemical spill incident, we see a semi-rural community with no manufacturing base where very few people are up after 11 PM or Midnight. So an EAS activation goes into the category of "if a tree falls in the forest and nobody is around, is there a sound?"
Radio listening in that sort of market is likely below 1% at 2 AM which is, IIRC, about the time that local authorities wanted to activate EAS without knowing how. If we expect that 1% or less to get out of bed and, like Paul Revere, alert all their neighbors, the amount of time needed to get dressed and get out far exceeds the time needed to do landline and cell calls.
At the peak times of the day, radio does NOT reach 87% of the population. At the low points, it does NOT reach 99% or more. For certain emergencies, it is a very poor system even when combined with TV and cable. That is why, as I mentioned, phone contact (both cellular and landline) was used in recent Los Angeles fires to alert residents living near burn areas.
Also keep in mind that about 25% of American homes are cell phone only, and in the under-35 group the percentage approaches 40%.