What will be sent out Wednesday afternoon is just a test. "No action is needed".
The test originally had been scheduled for September 20, but was postponed to Wednesday, its backup date, because of Hurrican Florence. In addition, the FCC also will conduct a national test of the Emergency Alert System via radio and TV broadcasters, cable providers, satellite radio and TV operators, and wireline video providers at 2:20 p.m. EDT, lasting about one minute.
A nationwide test of the United States' new Wireless Emergency Alerts, the first of its kind, is set to take place on Wednesday. Users can not opt out of receiving the WEA test. During this time, WEA compatible cell phones that are switched on, within range of an active cell tower, and whose wireless provider participates in WEA should be capable of receiving the test message.
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The WEA test will be broadcast over the course of about 30 minutes and sound the same as an AMBER Alert. The subject will read: "Presidential Alert".
The nationwide test will pop a message box up on your phone, accompanied by a tone and vibration. Some cell phones will receive the message; others will not.
This is a test of the nationwide alert system to warn the public about unsafe weather, missing children and other critical situations, and you may notice that your phone makes a different notification sound to normal. Neither Trump nor any other US president will be able to use the WEA system for any objective other than alerting citizens about a national emergency, according to FEMA. "No action is required".