Your phone will make an alarming noise Wednesday at 2:20 p.m. ET unless you turn it off first

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The Federal Emergency Management Agency and the Federal Communications Commission are set to test the national public alert and warning system on Wednesday. Nearly all smartphones connected to a cellular network will deliver a message, alongside an alert sound and vibration: "THIS IS A TEST of the National Wireless Emergency Alert System. The FEMA tests are designed to make sure the U.S. government can get important messages to Americans in emergency situations. A law passed in 2015 says FEMA needs to conduct a nationwide test every three years. "We want to make sure that when it counts, we can keep you informed," FEMA administrator Deanne Criswell said in a short video.

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