Why cant i see which sim is getting the call on s7 duos.

[Madhven]

I have a galaxy s6 duos and s7 duos each. I used to get the icon of Sim card a call was coming on. After an update to marshmallow it has stopped. I can see the icon on the small call screen if i am using another app. But if the phone is on home mode or locked. Not sure what went wrong as both phones dont show the sim icon any more. I think there is a fix but cant find it now. Any help greatly appreciated.

 

[B. Diddy]

Moved from the Marshmallow forum to the S7 forum, since this is more of a device-specific question.