Emergency alert test going out to mobile phones nationwide

WASHINGTON (AP) — About 225 million mobile devices across the U.S. will receive a test emergency alert Wednesday.

It's the first nationwide test for a wireless phone emergency alert. It will be sent at 2:18 p.m. EDT.

The Federal Emergency Management Agency says it'll sound like an Amber Alert or flood warning. The subject will read: "Presidential Alert." The text will say: "THIS IS A TEST of the National Wireless Emergency Alert System. No action is needed."

A test of broadcast systems will happen at 2:20 p.m. EDT.

FEMA officials say the test will last about a half-hour so some people may get it at different times. They expect about 75 percent of all wireless users to get the alert. The alert would be used in the event of a major nationwide emergency.

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President Trump holds rally in Montana
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President Trump holds rally in Montana
U.S. President Donald Trump speaks during his "Make America Great Again" rally in Billings, Montana U.S., September 6, 2018. REUTERS/Kevin Lamarque
U.S. President Donald Trump greets the crowd as he arrives for his "Make America Great Again" rally in Billings, Montana U.S., September 6, 2018. REUTERS/Kevin Lamarque
Supporters cheer as U.S. President Donald Trump arrives for his "Make America Great Again" rally in Billings, Montana U.S., September 6, 2018. REUTERS/Kevin Lamarque
A young man in a cowboy hat attends U.S. Donald Trump's "Make America Great Again" rally in Billings, Montana U.S., September 6, 2018. REUTERS/Kevin Lamarque
U.S. President Donald Trump greets the crowd as he arrives for a "Make America Great Again" rally in Billings, Montana U.S., September 6, 2018. REUTERS/Kevin Lamarque
U.S. President Donald Trump greets the crowd as he arrives for his "Make America Great Again" rally in Billings, Montana U.S., September 6, 2018. REUTERS/Kevin Lamarque
Supporters react during U.S. President Donald Trump's "Make America Great Again" rally in Billings, Montana U.S., September 6, 2018. REUTERS/Kevin Lamarque
U.S. President Donald Trump greets the crowd as he arrives for his "Make America Great Again" rally in Billings, Montana U.S., September 6, 2018. REUTERS/Kevin Lamarque
US President Donald Trump speaks during a 'Make America Great Again' rally in Billings, Montana on September 6, 2018. (Photo by Nicholas Kamm / AFP) (Photo credit should read NICHOLAS KAMM/AFP/Getty Images)
US President Donald Trump speaks during a 'Make America Great Again' rally in Billings, Montana on September 6, 2018. (Photo by NICHOLAS KAMM / AFP) (Photo credit should read NICHOLAS KAMM/AFP/Getty Images)
Montana State Auditor and GOP candidate for Senate Matt Rosendale (R) speaks next to US President Donald Trump during a 'Make America Great Again' rally in Billings, Montana on September 6, 2018. (Photo by NICHOLAS KAMM / AFP) (Photo credit should read NICHOLAS KAMM/AFP/Getty Images)
Montana State Auditor and GOP candidate for Senate Matt Rosendale (R) speaks next to US President Donald Trump during a 'Make America Great Again' rally in Billings, Montana on September 6, 2018. (Photo by NICHOLAS KAMM / AFP) (Photo credit should read NICHOLAS KAMM/AFP/Getty Images)
US President Donald Trump speaks to the press during a 'Make America Great Again' rally in Billings, Montana on September 6, 2018. (Photo by NICHOLAS KAMM / AFP) (Photo credit should read NICHOLAS KAMM/AFP/Getty Images)
US President Donald Trump smiles at the crowd during a 'Make America Great Again' rally in Billings, Montana on September 6, 2018. (Photo by NICHOLAS KAMM / AFP) (Photo credit should read NICHOLAS KAMM/AFP/Getty Images)
US President Donald Trump speaks during a 'Make America Great Again' rally in Billings, Montana on September 6, 2018. (Photo by NICHOLAS KAMM / AFP) (Photo credit should read NICHOLAS KAMM/AFP/Getty Images)
US President Donald Trump arrives to a 'Make America Great Again' rally in Billings, Montana on September 6, 2018. (Photo by NICHOLAS KAMM / AFP) (Photo credit should read NICHOLAS KAMM/AFP/Getty Images)
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