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Google Mobile Uses Private iPhone APIs

Google’s just-released and much-publicized update to their Google Mobile iPhone app features some very clever interaction design for the voice search feature. There is an on-screen button you can tap to initiate a voice search manually, but, as illustrated in their example video, you can initiate a voice search just by lifting your iPhone to your ear.

But here’s the intrigue: There is no public API in the iPhone SDK for using the proximity sensor in this way.