No Service on iPad 3g after Jailbreak

Hi, I jailbroke my ipad 3g 4.21 with Greepoison RC5 and it has been working great. I didn't have a SIM card in the iPad when I jailbroke it but now I want to use it on 3g as well as wifi. I put a new.

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No Service on iPad 3g after Jailbreak