After updating from iOS 6.0.1 to 7.1.1, I get a invalid SIM card error. Help.

I

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i update my iphone4s ios 6.0.1 to 7.1.1
error sim card invalid
 

Highrisedrifter

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Sep 19, 2012
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I had the same issues with my iPad 2 and removing, gently cleaning and reinserting the sim card sorted it out.

Sometimes, putting the phone into Airplane Mode and out again an kick start the sim too.
 

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