AdaptiveImage.cs

private static bool ShouldLoadHiResolutionPicture()
{
    var connectionCost = NetworkInformation.GetInternetConnectionProfile()?.GetConnectionCost();

    if (connectionCost == null)
    {
        return false;
    }

    switch (connectionCost.NetworkCostType)
    {
        case NetworkCostType.Unrestricted:
            return true;

        case NetworkCostType.Fixed:
        case NetworkCostType.Variable:
            return !connectionCost.ApproachingDataLimit && !connectionCost.OverDataLimit && !connectionCost.Roaming;

        default:
            return false;
    }
}