(I work for a company that provides guest WiFi services in public spaces.) It's usually not that those specific services are whitelisted, but that a number of

(I work for a company that provides guest WiFi services in public spaces.) It's usually not that those specific services are whitelisted, but that a number of hostnames have to be whitelisted for the user experience. Sometimes, those hostnames include those types of services, depending on the phone, OS, carrier, etc.