https://www.cnn.com/2018/09/15/polit...est/index.html

Washington (CNN)You'll soon be getting a message on your phone from the President of the United States -- whether you are a supporter or not.It's not a political message, but an emergency test message sent from President Donald Trump as part of the Federal Emergency Management Agency's system to warn the public in cases of national emergencies.
A majority of cell phone users will receive an alert on Thursday, September 20, with the header "Presidential Alert" and the message, "THIS IS A TEST of the National Wireless Emergency Alert System. No action is needed."