And in January, Hawaii's emergency system sent out a false alert of an incoming ballistic missile to over one million cellphones.
The WEA test will be broadcast over the course of about 30 minutes and sound the same as an AMBER Alert. So older phones with updated software may still get the alerts. It will also be the first year a WEA has ever been combined with an EAS, which is the national public warning system!
The countrywide test, a joint effort of the Federal Emergency Management Agency and the Federal Communications Commission, will use the same tone and vibration as tornado warning and AMBER Alert warnings.
The FEMA official said that in past, smaller tests, about 75% of phones received the alert.
A separate alert on TV and radios will be issued at 2:20 PM (2320 hours, Pakistan time).
The content of the message will also make it clear you've received the test message.
The goal of Wednesday's test is to check how well the system works and iron out any wrinkles that do crop up, so that it works properly in the event of a national emergency.
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The cellphone alert will be accompanied by a similar test of the Emergency Alert System, an older system that handles radio and television.
FEMA reports that this alert is different from a text message, meaning you can not respond and that "your phone number is not shared with anyone".
A nationwide test of the United States' new Wireless Emergency Alerts, the first of its kind, is set to take place on Wednesday.
You can click on the "Related Link" with this story to go directly to FEMA's website with additional information about what to expect. "No action is needed".
If it's not from President Trump, who is sending it? If this had been an actual emergency an official message would have followed the tone alert you heard at the start of this message.
Of course, to receive the alert, your phone will need to be turned on and connected to a cell tower that allows you to connect to your participating carrier. "Testing the system that public safety officials use to deliver urgent alerts and warnings to the public in times of an emergency or disaster is necessary". Others will not. No action is required.