Instructions in this article apply to iPhone 7 and later.
Earlier models had hardware switches, but the vibration parameters were inSettings>Sounds.
This switch is located above the two volume buttons on most iPhone models.
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This is the iPhone’s physical mute switch.
Another on-screen icon appears to indicate that the phone ringer is active once again.
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With them, the phone vibrates but otherwise stays silent when there’s an incoming a call.
Use the parameters to configure the iPhone to vibrate to signal a call.
Go toSettingsand selectSounds & Haptics(orSoundson some older versions of the iOS).
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To access these parameters, open theSettingsapp, scroll down, and tapSounds & Haptics.
Several things could cause this.
TheDo Not Disturbfeature may be enabled.