STATEN ISLAND, N.Y. — Cell phone users across the United States will receive a text message on the same day at the same time.

Designed by the Federal Emergency Management Agency (FEMA), the message will test a system allowing President Trump and future presidents to send out nationwide emergency messages.

FEMA will test the nationwide Wireless Emergency Alert (WEA) on Oct. 3 at 2:18 p.m., followed by a nationwide emergency alert test on broadcast television and radio.

Here's what you need to know.

The "presidential alert" was originally planned for Sept. 20, but was postponed to Oct. 3 due to ongoing response efforts to Hurricane Florence. Anyone with a cell phone will receive a messaged titled "Presidential Alert." The message will read: "THIS IS A TEST of the National Emergency Alert System. No action is needed." The test will last about one minute. About 100 carriers will partake in the test. The Wireless Emergency Alert system is used to warn the public about dangerous weather, missing children and other critical situations through alerts on cell phones. Cell phone users cannot opt out of receiving the emergency alerts.

The test will allow FEMA to "assess the operational readiness of the infrastructure for distribution of a national message to determine whether improvements are needed."

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