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I don’t always get alerts when I should. I go to settings, Sounds & Haptics, Ringer & Alerts shows sound all the way up. I press it to hear the sound, and Silent Mode Off pops up. How does Silent Mode get turned on to start with?
iPhone XS
Probably from the ring/silent switch on the left side of the phone being accidentally moved. See: How to put your iPhone on vibrate, ring, or silent mode - Apple Support
Probably from the ring/silent switch on the left side of the phone being accidentally moved. See: How to put your iPhone on vibrate, ring, or silent mode - Apple Support
iPhone silent mode
