Support can't find simcard galaxy S3

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http://androidforums.com – hello, sorry for my bad english. I have a problem. My galaxy s3 is broken after water detection. I have cleaned the phone and its fine and starts. Wifi, bluetooth, speakers is fine. But! The phone cant find the simcard, it can found the micro sd but not the sim. Is a symbol like zero (0) and a right line one it. It never ask a password so the phone cant find the sim card. Its tells me to put in simcard ore whatever when i go to menu / mobile network. I have replaced the sim card reader. google sim card reader samsung galaxy s3 No clue ? Hmmm where is the antenna for 3g (General)