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Seems odd to me that the Siri assistant feature would be available only for the iPhone 4S. I have the Siri app (from the company Apple bought and integrated into the OS) running on my 3GS and it works just fine. So what gives? It surely isn't hardware. Then what? Just to move more 4S units?

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closed as not constructive by bmike, Nathan Greenstein Oct 5 '11 at 3:35

As it currently stands, this question is not a good fit for our Q&A format. We expect answers to be supported by facts, references, or expertise, but this question will likely solicit debate, arguments, polling, or extended discussion. If you feel that this question can be improved and possibly reopened, visit the help center for guidance.If this question can be reworded to fit the rules in the help center, please edit the question.

We can't answer for Apple's decisions. Anything here is just specification. – Nathan Greenstein Oct 5 '11 at 3:35
wow, the close police is getting pretty strict – 太極者無極而生 Oct 5 '11 at 4:43
There's no such thing as close police, this question adds nothing constructive, what difference does it make? Apple decided to make it 4S for different reasons, some may be technical, some may be purely from a business' point of view. In any case, check the :) – Martín Marconcini Oct 5 '11 at 6:04
up vote 5 down vote accepted

It's supposed to use the phone's processor to do the voice recognition instead of sending the recording to the cloud to recognize as the Siri app does. This (apparently) requires the A5 processor.

It probably doesn't hurt, though, that it'll push 4S units.

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That's not unreasonable. I've seen other audio analysis apps designed for 3GS/4 fail spectacularly on the 3G. – Hand-E-Food Oct 5 '11 at 0:58
If this was the case Siri should work with the iPad 2. – Graeme Hutchison Nov 22 '11 at 15:01

The other theory I've heard is that voice recognition and text-to-speech takes up a lot of RAM, and coupled with the suggestion from a couple of tech writers who got some hands on time{1} that the 4S actually has 1GB of RAM, it makes some sense.

It would also explain why the iPad 2 doesn't seem to be getting the Siri stuff, despite having the A5.

And having it as a feature to push upgrades sure doesn't hurt either.

{1} John Gruber from Daring Fireball on the 5by5 coverage of the event and Josh Topolsky from This is My Next

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