I've built a timer app and one problem I have is when it's backgrounded, I'm unable to ring the timer if the user has volume off. Turning the volume or sound off also mutes notifications, which is the method I was using for ringing the timer in the background.
I just bought a tile and discovered it can ring your phone even on silent. I have tested this and it works in iOS 9, but I'm not sure how to duplicate this behavior.
How is ringing the iPhone in silent mode accomplished? Background refresh? Motion and activity? Something else?
Prior art:
- this answer plays in silent mode, but does not address when the app is closed. same here
from Play a sound on my backgrounded app when the phone is in silent mode
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