My iphone says no service after jailbreak?

So i jailbroke my iphone and now it says no service i don't know what's wrong with it I really need your help. Its ios 7.1.2 Pangu iphone 4 8 gb

Yes this has been a known issue withe the Pangu Jailbreak. To fix it you need to restore your phone to the latest os again without doing a restore from backup then jailbreak right after it is restored to factory setting and you should be good to go.

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