Can anybody explain about the 'Advanced calling and messaging' option?What's the use and how it affects calling and messaging?

Where can i find screen mirroring option or cast screen in j7 max?

Will Galaxy J2 2016 get nougat update?If it won't get nougat update then will it be getting atleast the samsung experience 8.1 new UI update?

Facing some issues on my J7 Max:1) Screen flickers(brightness increase n decrease mildly) while playing game and watching videos in youtube...it dims-brightens for few seconds then its normal, after sometime again it fickers.(Auto brightness is off)2...