Can't enable siri in my iphone 5?

I clicked on reset all content and settings and setup my iphone, when I was asked if I want to use siri, I selected NO. Now I want it back. How can I do that without resetting the iphone again? I went to settings > general > but there are no traces about any siri setting.

The Siri setting should be in setting, general, Siri. Thats impossible not to be there

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