Thanks, @BIBURYBILL. Are your phone and TV both on the same network? Can you also check the software version on both are up to date? The latest on your TV is 1152.8. You can check this by pressing Menu/ Settings on your phone and going to Support > Software Update.
If you have a s7 you should have smart view already built into the phones firmware so do the TV, if you pull down on the menu bar of your phone start smart view and you should see your TV. Now of smartview is not picking up the TV and you are connected to same wifi there is a issue with a update with the phone or TV. Now for the phone not showing the apps you installed the issue maybe with the phones firmware. They may have disable that function on the s7 forcing you to upgrade your phone. I know you have notice new devices does not work with old devices when it was stated it will.