The most common reasons an alarm on an iPhone may not go off include:
- Attention Aware Features on iPhone X and later, which can lower alarm volume if the phone thinks you are looking at it.
- The alarm volume being too low or muted.
- Do Not Disturb or Sleep Focus mode being enabled, which can silence alarms.
- Alarm settings being incorrect such as the wrong time or no sound selected.
- Software glitches or outdated iOS versions.
- Bluetooth connections routing audio away from the phone speaker.
- Face ID features that lower volume when recognizing your face.
To fix the issue:
- Turn off Attention Aware Features: Settings > Face ID & Attention > disable Attention Aware Features.
- Increase alarm volume: Settings > Sounds & Haptics > Ringer and Alerts volume up; disable "Change with Buttons" to avoid accidental volume changes.
- Ensure Do Not Disturb / Sleep Focus is off before bedtime.
- Check alarm settings for correct time, sound, and repeat options.
- Restart the iPhone.
- Update to the latest iOS version.
- Disable Bluetooth if alarms are routed to external devices.
- If using Face ID, consider toggling it off in Settings > Face ID & Passcode.
These measures will usually restore reliable alarm function on an iPhone.
