Some iPhone 3GS units emitting high-pitched tone

A number of iPhone 3GS owners are reporting a high-pitched tone emanating from the device’s speaker following the play of nearly any system sound. The issue, reported by Boy Genius Report and detailed further in an Apple discussion thread, appears to be triggered any time the phone makes a noise—such as when using the keyboard or locking/unlocking the phone. The noise may be inaudible to some users due to its high-pitched nature, which BGR estimates to be in the 15KHz range. It is currently unclear how widespread the issue is, and whether or not it can be fixed via a software update as opposed to a hardware replacement.

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