How to use siri on iPhone 4s?

I recently bought iPhone 4s, whenever I wanna use Siri, it says: sorry I can't take any request right now, please try again in a while
I have net connection n I live in Iran
How can I use it?

Okaay! Don't worry, just go on Apple Siri Support (FAQ) here - http://www.apple.com/...i-faq.html
& confirm it from there…

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