Error Sim, Invalid Sim ios 5.1.1

I have an iphone 4 with vodafone and from the 5.1.1 update I get errors sporadically sim, sim invalid. Is solved when I put the mobile in airplane mode, but after a few hours I happens again the same error.
I tried to restore the phone but the error persists.
Anyone but him? How I can fix it?

Replace the SIM card with a new one from Vodafone.

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