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I tried to update my android version on samsung galaxy s2 and it worked but after few days a problem occured: I can't put any sim card in the phone.

What should i do? My IMEI is missing in the option About phone.

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How did you update? Is the sim card loose? Might need a little bit of pressure applied to the sim card to force the sim reader to make contact with the card itself... Does that same sim card work on another phone? – t0mm13b Oct 9 '12 at 21:39

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