This setting is accessed through the controls app in the Ringer and Alerts section.

Heres how to turn up your iPhone alarm volume:

initiate the controls app, and tapSound & Haptics.

Locate theRinger and Alertssection.

iPhone Sounds & Haptics settings showing Ringer and Alerts slider and Change With Buttons option

Tap and hold the slider, and drag it all the way to theright.

SelectSound>Pick a Song.

Choose a song from your Library, and then selectBack>Save.

If it’s too low, go toSettings>Sounds & Hapticsand adjust the volume slider.

If your iPhone alarm isn’t going off, your volume may be off or set too low.

you’re free to also try rebooting your iPhone or choosing a louder alarm tone.