How to enable dual sim function ongalaxy s7 dual sim oreo o

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Android Central Question

After update to 7.65 there is no icon for sin card 2. How can I enable this? Thank you
 
Welcome to Android Central! Was this an official over-the-air system update for the phone, or did you download the firmware from somewhere and install it manually using Odin? If the firmware wasn't intended for your specific phone, that could be why you can't access the 2nd SIM.