DescriptionU.S. presidential mobile phone alert (animated).gif
English: The first test of the United States national wireless emergency system by the Federal Emergency Management Agency (FEMA) was broadcast to an estimated 225 million electronic devices at 14:18 EDT on 3 October 2018. The text message was accompanied by a flashing warning sign and warning tone. The president may direct FEMA to broadcast such alerts only for national emergencies or if the public is in danger. The facility may not be used for personal messages from the president. Mobile phone owners can not opt out of these warnings.
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