The Wireless Emergency Alerts (WEA) system is already in use in the U.S. -smartphone users are likely familiar with the loud, droning tone of flood warnings or Amber alerts.
Presidential alerts will only be sent out if there is a national emergency that is not extreme weather or Amber Alerts.
Despite Trump's frequent use of Twitter as a method of communicating, experts told NBC News on Friday that Trump would not overuse the "Presidential Alert" system.
WEA was technically launched in April of 2012, but this will be the first time FEMA has tested the system on the presidential level in hopes to work out the kinks, the agency said in a press release this week.
The test message will have a header that reads "Presidential Alert", according to the agency.
You've probably already heard of the Emergency Alert System, which sends a national public warning via radio and television in the event of an emergency and conducts periodic tests. "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".
"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", FEMA said.
The U.S. government is preparing to conduct the first nationwide test of a feature created to help the president reach the public during emergencies by sending warnings relayed through the country's largest wireless network providers to mobile phones within range.
You don't need to take any action for the test.
FEMA is also tasked with ensuring that the President can alert the public under all conditions in cases of national emergencies, including natural disasters and terrorist threats.
The WEA system is already used to warn the public about missing children, unsafe weather and other vital information, FEMA said.