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by solutionyogi 5324 days ago
Actually, Apple included an additional proximity detector to make sure Siri works when you bring the phone to ear. Here's iFixit report:

http://www.ifixit.com/blog/blog/2011/11/09/little-sister-sir...

This means that Siri won't provide optimum experience (pick the phone to ear and Siri is ready to take the command) for iPhone4 and older versions.