I'm about to go on a cruise, and the ship has its own WiFi. If things are the same as before, they allow a very small amount of data a day for free (beyond that requires purchasing data). To use this free data, I go to a certain web page and sign in. At this point, I have full internet access until I sign out.
So the question is, can I limit the WiFi data (or overall internet data) usage to only the things I specifically allow?
I know there are plenty of options for restricting data usage to WiFi only, but this is about restricting access while connected to WiFi.
I need to restrict 2 phones - a Galaxy S5 and S6 Edge.