says no sim card but calls work

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Jan 11, 2016
i have a galalxy grand gt-i9082. i updated it to cm 12.1 and its now android 5.1. when i lock the screen the line comes in "NO SIM CARD DETECTED-NO SERVICE". the calls works fine!! :) IMEI is also available.
my cyanogenmod ver- cm12.1-20150405-i9082
any suggestions getting out of this?:rolleyes: