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If I set the iphone alarm clock with a ringtone, how long will the ringtone run if I do not stop it?

Will it run all the way until it runs out of battery and the phone shuts down?

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up vote 2 down vote accepted

I just tested this with iPhone 3GS iOS 5.1 and the alarm stopped after exactly 15 minutes.

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Indefinitely, near as I can tell. I once had my phone go for over a half hour on an alarm.

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a half hour and indefinitely is totally different. –  Pacerier Jul 22 '11 at 14:29
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Since the ringtone almost certainly isn't 20+ minutes, it's obviously looping the tone. No setting users can control last longer than 5 minutes, so I'd call 30m ~ indefinitely. It would be theoretically interesting to see if either of the low voltage alerts pause the audio, but I'll leave that for another day ;-) –  bmike Jul 22 '11 at 14:39
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@bmike is right. Since the phone is looping the same sound, 30 minutes might as well be indefinitely. There is a reason why I qualified my answer with "near as I can tell." –  Philip Regan Jul 22 '11 at 14:48
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