Android
Change Default Alarm Sound auf Android
The alarm sound on Android is stored separately from your ringtone and notification sound, even though all three live in the same sound settings screen. This separation exists so an incoming call or a chat message never interrupts an alarm with the wrong tone, and so you can keep alarms loud and distinct while keeping notifications quiet.
To change the default alarm sound, go to Tap on Settings ➔ Tap on Sound & vibration ➔ Tap on Default alarm sound ➔ Choose a Category ➔ Select an Alarm sound and tap on Save. The category list groups sounds by type, so you can browse for something more noticeable than the default tone before confirming your choice.
This setting only changes the sound used by new alarms and any existing alarm still set to the default option. If an individual alarm already has its own custom sound assigned, changing the default here will not overwrite that specific alarm. Keep in mind that alarm volume is controlled separately from media and ringtone volume, so a silent alarm is often a volume slider issue rather than a sound selection problem.