Why Won't My Unlocked iPhone 3GS Activate After I Updated It?

I got my iPhone 3GS unlocked, however, it said it needed updated, so I updated it. After it was updated, it won't activate now and I don't know what to do. How do I fix this?

Take it back to where you got it unlocked from and say wtf is goin on. It shouldn't lock after an update. My phones unlocked. And change sims often. And recently updated it. Works fine. Don't think they unlocked it properly

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