I've upgraded my 3gs to ios 5.1 and I get a "no sim" error. please help!

Hello everyone,
I recently updated to the new itunes and it prompted me to upgrademy iphone 3gs to ios 5.1. I did so and now I cannot activate my phone. I am stuck on the set up, which I go through, only to get the "no sim" error. Have removed sim (tested - works in another phone), replaced into iphone and tried activation again with no luck. Any offerings are much appreciated!
Apple, you are pulling a blackberry.

gdgmacguy,
Thanks for the response.
1. My comment re: blackberry is not meant to be ignorant. Truth is that many iphone users are experiencing the same issues with essentially no connectivity to any network. So, my comment is meant to be actual fact. In fact, as of last night (Jan 5th), i still see many isers - 4gs, ipad2, many devices - still experiencing the same issue.
2. Thanks for the "more like this box tip. I have read through all relevant tips/advice and no luck. Have tried removing/reinserting SIM but nothing. Have cleaned sim and sim tray and nothing. Tested sim in an older phone and sim works fine.
But do appreciate your reply.

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