Why doesn't my iPhone 4S activate Siri?

It is an iPhone 4S btw, I'm sure.
I've went settings-general- and Siri is not there. When I hold my home button down only voice control works. Yes I have iOS 7

Are you absolutely sure it is a 4s? If Siri isn't there… It is a 4.

Settings > General > About. Scroll down to model number. Google that to check.
Also see this list and see what's printed on the back glass of your's. Betting it's a 4 only. Best luck.
http://support.apple.com/.../kb/ht3939

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