Enabling and Disabling the Proximity Sensor
Proximity is an iPhone-specific feature at this time. The iPod touch and iPad do not offer proximity sensors. Unless you have some pressing reason to hold an iPhone against body parts (or vice versa), using the proximity sensor accomplishes little.
When proximity is enabled, it has one primary task: It detects whether there’s a large object right in front of it. If there is, it switches the screen off and sends a general notification. Move the blocking object away, and the screen switches back on. This prevents you from pressing buttons or dialing the phone with your ear when you are on a call. Some poorly designed protective cases keep the iPhone’s proximity sensors from working properly.
Siri uses ...
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