PIN is typed in correctly, but phone still says No SIM.

Hey guys, have any of you ever experienced this kind of problem? When I start (restart) my L930 it immidietaly shows me Sim error message. So I tap okay or continue or whatever, then I lock and unlock the phone. When trying to swing the unlock page up, it asks for pin, so I enter the pin, phone unlocks and vuola, still nothing, No sim as it said before. how is that even possible knowing that I typed the pin in? Thanks a lot for aany response

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