SOS was first transmitted in the U.S. in 1909 from the Arapahoe vessel and was later used alongside CQD when the Titanic was sinking. The U.S. officially adopted the signal after Titanic.

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If you've noticed your phone in SOS after a bout of bad weather, you're not alone. Here's what it means and how to troubleshoot the issue.

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To use Emergency SOS via satellite, you first need to try to make an emergency call, like 911. If no networks are available, then the Emergency Text via Satellite option appears on screen.