Upgraded iphone 4 firmware from 4.3.3 to 5.01 and now it says sim card not supported now

i just upgraded my iphone 4 firmeware from 4.3.3 to 5.0.1 and after it restarted it says that the sim card doese not appear to be supported.  i already went to the att store and they inserted a new card and tried to activate it and it says the same thing.  my phone work great before the upgrade to the firmware and i read that lots of other people have had the same problem and brought there pnones into an apple store and had them replaced due to the faulty upgrade. what can you do for me

This is a user to user help forum only, so no one here can do anything for you except provide recommendations.
Have you tried restoring your iPhone with iTunes?
If so with no change, make an appointment at an Apple store if there is one nearby.

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