HT4972 i have just updated my 3S and it has failed to activate. what can i do?

i have just updated my 3S and it has failed to activate. what can i do?

Has the software on your phone been modified before you tried to update the firmware? If yes, jailbreaking the phone could be the reason for your problem.
If the device has not been jailbroken, try these steps:
Restart the iPhone.
Try another means of reaching the activation server and attempt to activate.
Try connecting to a known-good Wi-Fi network if you're unable to activate using a cellular data connection.
Try connecting to iTunes if you're unable to activate using Wi-Fi.
Restore the iPhone.
If you receive an alert message when you attempt to activate your iPhone, try to place the iPhone in recovery mode and perform a restore. If you're still unable to complete the setup assistant due to an activation error, contact Apple for assistance.
copied from iOS: Troubleshooting activation issues

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