It’s actually a no opt out alert test from FEMA to most digital media devices, but the main stream media is playing the scary Trump card:

“Americans to receive cellphone alert from Trump in first national test

It's the alert that – if it's real – you won't want to get again. For the first time ever Wednesday, Americans nationwide will receive an alert on their cellphones from President Trump. The test, scheduled for 2:18 p.m. ET, is the first test of a national presidential alert system that will let any president issue a warning about a crisis. That could include a missile launched by another country at the U.S. or a tsunami.
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https://www.cbsnews.com/news/presiden...