Can I used.the siri in my own language, in ios7 Iphone 4s?

I would like to know. That I can used my own language in siri. Because I can't speck foregone languages so please tell me how to fix that option.

Siri can be used in many languages. For more information on this, go to settings -> general -> siri -> language
In there, you can select from an extensive list, to what language you would like siri to use.

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