When mobile devices utilize cellular data from the mobile service provider, DNS settings are not changeable (at least, not in iOS devices). I would like to suggest that Cisco/OpenDNS/Umbrella form partnerships with mobile service providers to offer OpenDNS content filtering for mobile data. The customers could have access to their OpenDNS/Umbrella portal and determine which categories, and sites should be blacklisted or whitelisted. For parents with children, it should be possible to support all devices in a family plan, with individual policies being defined based on the device, to have content filtering based on the restrictions for a child, teen, adult, etc.
I know that Cisco offers a feature like this to business customers, but it requires the installation of AnyConnect, which always tunnels connections through the Internet to OpenDNS. This solution may work for businesses, but is not really an option for consumers.
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