Why isn't my alarm ringing on my iPhone 4?

I have 3 alarms set in the morning (I don't wake up very easily lol) but I always und up waking up late, but it shows the alarm names on the lockscreen, but aren't ringing, my volumes turned up tovthe loudest and it's not on vibrate

Isn't it in silent mode? If not, I suggest you to bring it to the technician or apple center.

Make sure the little switch on the upper left side of the phone is actually on. It can get accidentally switched to the off position, expecially if you don't have a phone case or cover. Happened to me, the same thing you are complaining about, and that was the reason.

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