In Settings > Emergency SOS, you can choose how to activate an Emergency SOS call.
A count down will begin and loud alarm will come off after 5 seconds.
Once the count down is over, it’ll call the police and share your location with them.
Sources:
https://appleinsider.com/articles/22/05/25/apples-iphone-emergency-sos-saves-woman-from-attempted-rape
https://www.phonearena[.]com/news/two-women-saved-in-canada-by-emergency-sos-via-satellite_id145246
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