I updated my iphone but in the latter part i couldn't activate it.  I tried it so many times but failed.What should I do?

I updated my iphone with the latest version, but in the latter part while I am setting it, I couldn't activate it . I tried it so many times but failed. What should I do?

Is there a sim in the iPhone?
Has the iPhone been jailbroken or modified to work with other than
the original wireless carrier?
What does it say when you look at Settings=>General=>About=>Carrier?

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