I have alarms set up in my iOS Clock app, with both "Vibrate on silent" and "Vibrate on ring" switches set to ON in the Settings app. For the last several months I've been relying on a silent audio file to create a vibrate-only alarm to wake me up. But this morning, it seemed to stop working — the alarm went off, but made no sound and did not vibrate. Only the screen lit up like usual.
I've tried deleting and re-creating the alarms, un-toggling and re-toggling the vibrate switches in Settings, trying alarms using the built-in ringtones, and rebooting the device, and nothing seems to make alarms vibrate again. As well, the state of Do Not Disturb mode has no effect (though it of course never has).
Even stranger, I also have some other iPhones to test, and they're all now inexplicably showing the same behavior.
- iOS 7.0.2
- iPhone 4S
- iPhone 5S
I've been using this standard alarm behavior for a long time, and suddenly it's not working without having performed an iOS update.