Alarm Clock Issue
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I read recently about that alarm clock issue with iPhones: those
alarm clock don't go off, and Apple is working on a fix.
But, it is still your responsibility to wake up on time, so
better test the alarm clock before counting on it.
Your phone company probably offer a wake-up call service. In the good
old days, you would have to specify an hour fifteen minutes earlier to
be sure you wake up on time. You can also buy yourself an alarm clock.
Redundancy is a good idea when you cannot afford to fail.