I cant activate my iphone 3gs after upgrade to 5.1.1

i cant activate my iphone 3gs after upgrade to 5.1.1

I am experiencing the same issue and could use some advice:
Yesterday I plugged my Iphone 3GS into my computer and I selected in Itunes to update to the latest IOS 5.1.1.
Before I did this the iphone worked correctly, and after I did this it will not let me access the apps at all. I went to the Apple store and the rep told me I needed to have a working AT&T sim installed in it to complete the upgrade. I went to the AT&T store and had them put one of their working sim card in and it would not work.  The AT&T rep said he has seen several people with Iphone 3GS who updated to the latest IOS 5.1.1 whos phones will not recognize the sim card and thus will not let you get to the apps. 
Does anyone know how to correct this problem?

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