One of the biggest selling points of the iPhone 4S – except for the amazing 8-megapixel camera and dual-core processor – is Siri, your humble virtual voice assistant. And for many who are not perfectionists about photography, having Siri on the more affordable iPhone 4 could steer them away from the iPhone 4S.But Apple has not brought Siri on the iPhone 4, and despite Cupertino not giving an official explanation, there’s one possible reason we haven’t looked at before.Linley Group analyst Linley Gwennap looked at how big the A5 chip on the iPhone 4S is and concludes that the extra area on the die is used by Apple for integrating noise-reduction technology.

Here's why the iPhone 4 did not get Siri (and won't get it)
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Here's why the iPhone 4 did not get Siri (and won't get it)