Decoding the phenomenon of all phones in the U.S. simultaneously ringing on 4/10

At precisely 2:20 PM on 4/10 (U.S. time, equivalent to 3:20 AM on 5/10 in Vietnam), the U.S. conducted a crucial test for the Emergency Alert System (EAS) and Wireless Emergency Alert System (WEA). This event is significant to ensure the effectiveness and readiness of the national alert systems against potential threats to the U.S.

EAS (Emergency Alert System) is the U.S. emergency warning system, established to alert the public about dangerous and urgent situations such as natural disasters, nuclear incidents, or other critical emergencies. This system utilizes radio waves to broadcast warning messages to media outlets such as radio, television, and electronic devices.

WEA (Wireless Emergency Alerts) is the wireless emergency warning system that allows authorized authorities to send short messages to the mobile phones of citizens to warn them about dangerous and urgent situations. WEA messages are directly transmitted from mobile broadcast towers to mobile phones in the affected area, accompanied by special sounds and vibrations to capture the attention of the public.

This nationwide test will cause people's mobile phones to unexpectedly ring and vibrate at 2:20 PM U.S. time on 4/10. A message will appear on the phones stating: 'This is a test of the National Wireless Emergency Alert System. No action is needed.'

The message will be displayed in either English or Spanish, depending on the user's device language setting. Television and radio users will also receive a similar warning message at 2:20 PM, with broadcasts temporarily paused for about one minute to display the test warning message. The test will last for 30 minutes. If your phone is turned off and on during the test, you will receive a message, ring, and vibration for alerting purposes.

This marks the second time the U.S. government is testing sending emergency alert messages to mobile phones nationwide and the seventh time testing alerts to television and radio. This test emphasizes the importance of ensuring that the national emergency alert system is still functioning well and capable of warning citizens in national emergency situations.

In the current period, the world is becoming more unstable with unresolved issues in political geography, leading some countries into unnecessary wars. Therefore, many advanced countries worldwide are investing significantly in security alert systems, systems that provide early warnings to citizens domestically.

Not only issues related to political geography, but also natural disasters such as floods and earthquakes occur unexpectedly. For instance, the dam failure incident in Libya resulted in tens of thousands of casualties. With advanced early warning systems, the risk of substantial human and property damage in the unfortunate event of a natural disaster can certainly be reduced.

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