How do I stop automatic data usage but still use wifi?
I will be going on a cruise in a few months and they have an app that is free to use on-board. The ship's WiFi will be free only for the use of their app. How do I shut down all notifications, updates, and background data usage so I do not have to pay the cruise line for WiFi use? Essentially, I need to know how to disable all data usage but keep the WiFi on for the on-board app. Thank you for your help.
iPhone 5s, iOS 8.4