I updated my iphone 3gprs but now it cannot pick my sim card it shows SIM CARD NOT ACTIVATED or INSERTED.

I updated my iphone 3gprs but now it cannot pick my sim card it shows SIM CARD NOT ACTIVATED or INSERTED.What do I do??

i have tried putting sim of another connection butit shows
"Could Not Activate iPhone
Your iphone could not be activated because the activation server is temporarily unavailable.Try connecting your iphone to iTunes to activate it, or try again in a couple of minutes."
but i have tried to connect it to itunes but thre also it shows SIM CARD NOT ACTIVATED or INSERTED.

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