I have a iphone 4s but it doesn't have siri?

I know it a 4s because the model number on the back is A1387 i can't find it in the settings>general anyone know what i have to do to get it back or what might of happened? I upgraded to the 6.1.2 maybe that's it?

Go to setting and general you can find Siri
Press on it and turn it on

If you're not afraid of losing info on your phone, go to settings, general, scroll down, select reset, select to reset all settings. This will erase the entire phone and bring you to the setup welcome screen where you can setup Siri again.

If I remember correctly, there's another way to pull that welcome screen process without doing an erase on the phone but I can't remember how that's done.

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