[Phone] What are some of the possible reasons my alarm doesn't work?

Your alarm doesn't set off and it may be caused by the following reasons:

A. Alarm volume is turned off

B. Alarm clock is turned off in Do not disturb mode

C. Repeat function is disabled

D. Ring gently function is enabled

E. Clock app is not included in protection list of Mobile Manager therefore clock is disabled when Super Boost is activated

F. Alarm clock settings is reset after system update