Missing an alarm can ruin your entire day. If your Galaxy S25 Ultra alarm is not going off, the problem is usually caused by settings that silently block sound, notifications, or background activity.
The good news is that this issue is fixable. Let’s walk through the most reliable solutions step by step.
Why Your Galaxy S25 Ultra Alarm Is Not Going Off
- Alarm volume is set too low or muted.
- Do Not Disturb or Sleep mode is blocking alarms.
- Battery optimization is restricting the Clock app.
- Alarm sound is missing or set to silent.
- Software glitches after an update or restart.
Check Alarm Volume Level.
Even if your phone volume is high, alarms use a separate volume control. If this is turned down, the alarm may play silently.
- Open Settings, and then tap Sounds and vibration.
- Tap Volume, and then drag the Alarm slider to the right.
Set it close to maximum to make sure you hear the alarm clearly.
Make Sure Do Not Disturb Is Not Blocking Alarms.
Do Not Disturb can silence sounds, vibrations, and notifications. While alarms are usually allowed, misconfigured rules can still interfere.
- Open Settings, and then tap Notifications.
- Tap Do Not Disturb, and then make sure alarms are allowed.
If you use schedules, temporarily turn Do Not Disturb off to test the alarm.
Disable Sleep Mode or Bedtime Mode.
Sleep mode can delay or silence alarms if its rules are set incorrectly. This is common if you recently changed routines.
- Open Settings, and then tap Modes and Routines.
- Tap Sleep, and then turn it off temporarily.
Test your alarm again after disabling it.
Check Alarm Sound Selection.
If the alarm sound is missing or corrupted, the alarm may trigger without audio. Choosing a default sound fixes this quickly.
- Open the Clock app, and then tap Alarm.
- Tap your alarm, and then select Alarm sound and choose a default tone.
Avoid custom sounds until you confirm the alarm works properly.
Exclude Clock App From Battery Optimization.
Battery optimization can stop apps from running properly in the background. This can prevent alarms from triggering on time.
- Open Settings, and then tap Battery and device care.
- Tap Battery, and then tap Background usage limits.
Add the Clock app to Never sleeping apps to prevent interruptions.
Restart the Phone.
Temporary system glitches can affect alarms, especially after updates or long uptime. A restart refreshes system processes.
- Swipe down from the top-right corner, and then tap the Power icon.
- Tap Restart, and then confirm the action.
After rebooting, set a test alarm a few minutes ahead.
Update System Software.
Alarm bugs are sometimes fixed through software updates. Keeping your device updated helps prevent recurring issues.
- Open Settings, and then tap Software update.
- Tap Download and install, and then install any available update.
Restart your phone once the update is complete.
Once alarms are working again, your Galaxy S25 Ultra should wake you reliably every time. Most alarm issues come down to volume settings, modes, or battery restrictions, not hardware problems.
FAQs
Will alarms still ring if my phone is on silent mode?
Yes. Alarms are designed to override silent mode, as long as alarm volume is set correctly and not blocked by modes.
Can Bluetooth headphones stop alarms from playing out loud?
Yes. If your phone is connected to Bluetooth audio, the alarm may play through that device instead of the phone speaker.
Does Power Saving Mode affect alarms?
It can. Power Saving Mode may restrict background activity, which can delay or silence alarms if the Clock app is limited.
