Why no service message is appearing in my at&t iphone 3gs?

I have bought an at&t iphone 3gs and now when I inserted my sim card in it, it says searching and after few minutes it shows an message “no service”. I have no laptop or pc and my phone is jailbroken. I don’t want to sync it to I Tunes. So can anyone help me? please give me instructions step by step.

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