Can't find Siri on my IPhone 4S?

I can't access Siri on my 4s. I've held the home button down and the only thing that comes up is voice recognition. I can't find Siri under general settings either… What should I do?

Pretty sure you have to press the button twice

Siri should be the 4th option under general. It is on my phone.

Siri should be in general settings. If she doesn't pop up then she must be off. You might need to turn her on. Haha good luck

Have you upgraded to IOS 5.1.1?
If you haven't, then upgrade.
Also, is your iphone new? You do need to enable siri first, if it is new.
But if you have had your iphone before, and siri just disappeared, then this shouldn't be happening.
Try performing a force reset by holding down the home button and the lock button together for a while. This should just turn your phone off and on again, and you may find siri again.
If you don't, I suggest contacting apple, or calling your phone service provider.

Are you sure it's a 4S?

You may be using 4, not 4S.