The test message will be sent at 11:18 a.m. PT/2:18 p.m. ET on Wednesday, though FEMA says it might take a few minutes for the test to make it to all phones.
The EAS message will read: "THIS IS A TEST of the National Emergency Alert System".
It is the first test of the national wireless emergency system by FEMA. "No action is needed" and will display the header "Presidential Alert".
The EAS test message will be distributed through radio and television broadcasters, cable systems, satellite radio and television providers, and wireline video providers.
FEMA officials said Tuesday they would share test result data on how the testing went with mobile carriers to help ensure the system works well in a true emergency.
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The test originally had been scheduled for September 20, but was postponed to Wednesday, its backup date, because of Hurrican Florence. On Wednesday, October 3, 2018, at 12:18 p.m. (MST) you'll receive a TEST text message. The TV and radio alert has been tested for several years.
THIS IS A TEST of the National Wireless Emergency Alert System. Others will not. No action is required. However, consumers cannot unsubscribe to the presidential alerts.
How Wednesday's nationwide emergency alert test message might look on an iPhone.
The system was launched in 2012.
Can I silence my phone or turn off the alert?
The EAS is a national public warning system that provides the President with the communications capability to address the nation during a national emergency. It's also possible that if you leave your phone off or have a call that lasts for more than 30 minutes, you might not receive the alert at all. If you do, then you know that the test, which thankfully will not allow Trump to simply inundate everyone's phones with his thoughts on the latest episode of Fox & Friends, was delayed... until tomorrow. FEMA says users can not opt out of receiving Wireless Emergency Alerts. This will be a test of the country's wireless emergency alerting system.