There is one method available for directly adjusting the alarm volume on your iPhone, though it isn’t as easy as asking Siri to do it for you — even though the assistant can adjust your regular media volume. Instead, in order to change your iPhone’s Alarm volume, you need to:
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Go to the App Drawer.
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Find and tap on Settings.
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Select Sounds and Haptics.
Now, at the top of the screen, you’ll spot a slider for Ringtone and Alerts. This controls your alarm volume independently of your standard media volume. Shifting the slider toward the right cranks up the alarm volume while moving it toward the left reduces it. If you don’t want to keep diving into settings every time you need to adjust the volume, there’s a shortcut: just below the slider, you’ll see “Change with Buttons.” Tap that, and now you can use the physical volume buttons to tweak the alarm volume on the fly.