The iPhone 3Gs third sensor has been confirmed as a second proximity sensor, according to an iLounge report.
"While the original iPhone offered only two front-mounted —one ambient light sensor and one proximity sensor—the iPhone 3G sports an array of three sensors (two proximity sensors, one ambient light sensor) in a J shape to the left of the ear speaker, moved from their original locations above and to the speaker’s right."
The third sensor was added to provide improved face proximity detection.
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"While the original iPhone offered only two front-mounted —one ambient light sensor and one proximity sensor—the iPhone 3G sports an array of three sensors (two proximity sensors, one ambient light sensor) in a J shape to the left of the ear speaker, moved from their original locations above and to the speaker’s right."
The third sensor was added to provide improved face proximity detection.
Read More