Sir, i upgraded my iphone 3gs to os 5.1 and since then i have not been able to register it in order to use it, anytime i try to activate it a notification that "the activation server is temporarily unavailable".can any one help me out?

sir,
   i upgraded my iphone 3gs to os 5.1 and since then i have not been able to register it in order to use it, anytime i try to activate it a notification that "the activation server is temporarily unavailable".if i connect it to itunes too, the system tells me to insert SIM card meanwhile, i already have inserted a SIM.
CAN ANYONE HELP ME OUT?

Try,,,
I deleted EVERYTHING under
C:\Users\YourUserName\AppData\Roaming\Apple Computer\iTunes
or YourUserName\AppData\Roaming\Apple Computer\iTunes
Some people have had success only deleting everything in the cookies folder
C:\Users\YourUserName\AppData\Roaming\Apple Computer\iTunes\Cookies
Thank you LadyBytes

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