S6 edge error of security alert

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My s6 edge tmobile version has a issue. After boot it gives a message "security alert: this device has been flashed with an unauthorized software and is locked. Contact service provider……..

….." everything is ok phone is working fine except sim card. Phone has no other issue but only sim card is not detected. It seems as if network is locked. How to solve this issue? First I reflashed stock rom to solve the issue but invain. Then I flashed a custom rom but issue is still there.

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