Let’s say the user leaves the phone on the table. (probably on home screen)
A few hours later, he picks it up. And when it does, the iPhone detects the accelerometer, and it rings.
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short answer: YES
The trick is to make sure the app doesn’t get backgrounded when the phone goes to sleep. The other elements like detecting changes in the accelerometer and playing a sound are all standard features.
As for the no sleep solution, it has been asked before, basically is you play a music sample the app will continue running, so perhaps a loop of silence continuously played.