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Extremely reliable, I use it everyday and it has never failed me 😀
The iPhone alarm clock is one of the reasons why I must have my iPhone. I have a bad memory and i use the alarm clock to remind me to do things during the week. I tend to hit the snooze button alot, and this alarm clock will pester you a hundred times until you end the alarm. Much more reliable than other phones.
The only thing to be wary about is when daylight savings time begins or ends.
Seems like Apple has screwed this up every year since the iPhone began.
I think this most recent daylight savings was the first one that wasn't effected by some bug or an other.
I have some that are set for work Mon-Fri and they've yet to fail to go off. That's actually better than the Sony alarm clock I have on my night stand.
I found the alarm to be 100% reliable - so far. 😉
If you don't want to mess with the snooze (I hate that second wake-up, the first time is bad enough 😡) - turn it off.
Well I used it for over two years and it was 100% reliable. But I recently got a basic digital alarm clock for beside my bed so that I can keep my phone in my office so I can sleep better. So I'm no longer using it anymore. Still the best phone alarm clock I've ever used.
the only time it's failed me is when i've set am/pm wrong or when i've ran the battery dry through the night somehow. it's crazy persistant for you to actually tell it to stop so i'd say it's pretty good 🙂