When you purchase a new Galaxy device it will come pre-loaded with network specific features and services, depending on where the device has been purchased from. This is because most devices have a specific service provider or SKU that indicates which network they are connected to. With True Single SKU, new devices have a common service provider. This means that when the device is set up, it will determine what service provider is being used and apply the specific service provider SKU.
True Single SKU devices will connect to a server during the initial set up to get information about the service provider. After set up has finished, the device will restart to apply the network specific features and services.