[daniel187]

Are anyone elses alarms very quiet when they go off?

[ven07]

There is a known issue with ringtones not playing when receiving new calls, so maybe yours is an extension of that..

[boltman2013]

My alarm fine on 635

[DalekSnare]

For me the alarm follows the ringtone settings, so if your phone is set to vibrate, the alarm will vibrate the phone instead of making a noise.