IPhone doesn't ring
My iPhone won't ring when I get an incoming call or when I receive a text
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Some things to check:
The ring/silent switch on the left side of the phone. See the following Apple article: Use the side, Home, and other buttons on your iPhone - Apple Support
Check the ringer volume at Settings > Sounds & Haptics > Ringtone & Alert Volume.
Do Not Disturb. See: Turn off Do Not Disturb - Apple Support
If none of the above, also try restarting. See instructions in: Restart your iPhone - Apple Support