The second nationwide test of the Wireless Emergency Alert was conducted on Aug. 11 at 2:20 p.m. Eastern on smartphones that have opted in.
The test was conducted to ensure that the Wireless Emergency Alert and Emergency Alert System effectively warn the public. The Wireless Emergency Alert appeared on smartphones that opted in.
In order to opt into future tests, iPhone users can dial a specific sequence of numbers in the Phone app. Dial *5005*25371# to enable test notifications. Dial *5005*25370# to disable test notifications.
Android users can toggle emergency test systems from the Settings app.
Smartphone users who opted in to testing the Wireless Emergency Alert received one test message at around 2:20 p.m. ET. The message was sent using the FEMA Integrated Public Alert and Warning System.
Devices received the alert via local cell towers. The test signal was be broadcast for 30 minutes and caused a message to display, reading: "THIS IS A TEST of the National Wireless Emergency Alert System. No action is needed."