If your phone, television or radio makes an alarming sound around 2:20 p.m.
Nearly all smartphones connected to a cellular network will deliver a message, alongside an alert sound and vibration: "THIS IS A TEST of the National Wireless Emergency Alert System.
This is the third nationwide test of the alert system, FEMA said.
The alert sound can't be turned off on smartphones if they are on.
While iPhones and most Android smartphones offer settings to opt out of certain government alerts, such as Amber alerts, users can't opt out of this test, FEMA said.
Persons:
Deanne Criswell, Amber
Organizations:
Federal Emergency Management Agency, Federal Communications Commission, National Wireless, FEMA, U.S