How to downgrade apple iphone software

Hello Friends and Apple support,
I have white color apple iphone 4S ios5 which i was purchase from US and using in india, today i update my mobile on ios6, and after completing the instalation my mobile sim was not working in my iphone, please tell me what was the reason behind this, and how i can downgrade my apple iphone software from ios6 to ios5.
please help friends

downgrading is not supported

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