Everyone will then receive this message in English: "THIS IS A TEST of the National Wireless Emergency Alert System".
News reports the Federal Emergency Management Agency is testing a warning system that will send "Presidential Alert" messages in the case of an emergency.
Americans will get a text alert from President Trump next week.
It's not a political message, but an emergency test message sent from President Donald Trump as part of the Federal Emergency Management Agency's system to warn the public in cases of emergency, such as risky weather, and missing children. "No action is needed".
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The WEA test will be sent through IPAWS, as part of the nation's modern alert and warning infrastructure that automatically authenticates alerts.
DHS&EM operations chief Bryan Fisher said that Alaska feedback is important as communications in the state differ from the Lower 48.
More than 100 major cell phone carriers will participate in the test at 2.18pm Eastern Standard Time Thursday and no one with a cell phone can opt out of receiving the text.
Former President Barack Obama signed a law in 2016 requiring FEMA to create a system that lets USA presidents send cellphone alerts regarding public safety issues like natural disasters and "terrorism".
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The system is used to warn the public in cases of emergency, such as risky weather, and missing children.
Experts NBC spoke with also didn't seem too concerned that Trump, who often takes to social media to harangue opponents and announce policy, would use the new messaging system in a similar way. Under the Warning, Alert, and Response Network (WARN) Act of 2006, cellphone users can not opt out of the presidential alerts. The law only allows messages that relate to "a natural disaster, act of terrorism or other man-made disaster or threat to public safety".
Emergency alerts will also continue to be available on NOAA Weather Radio, news broadcasts, the Emergency Alert System on radio and TV programs and via outdoor sirens. "The test is made available to EAS participants (i.e., radio and television broadcasters, cable systems, satellite radio and television providers, and wireline video providers) and is scheduled to last approximately one minute".
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A fourth person was killed while plugging in a generator in Lenoir County, north of Wilmington , WITN-TV reported. More than 1.7 million people in Virginia, North and SC were told to evacuate ahead of Florence's arrival.