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Sometimes, children who are unaware of how to use your device will press buttons in such a way that SOS mode will activate. So, if you have a young child who loves to play games on your phone, that may be what happened. You could also be the culprit if you have your phone, unlocked, in your hand or pocket. If you accidentally hit a bunch of things, SOS mode can turn on.
Source: https://www.distractify.com/p/why-is-my-phone-in-sos-mode
New Facebook Page: https://www.facebook.com/OsmaniTheOttoman/