DNS Firewall by KeepSolid

It will shock you as you observe the type of data harvesting taking place using apps that don't require internet access. Perfect application-level DNS Firewall. Just what I need and stops my bandwidth from being depleted by applications that I haven't even opened or even use. It turns out that my Chinese-manufactured phone is making calls for the manufacturer...this is insane! It's easy to turn access off and on per application so that even apps that you use are able to be disabled when not making use of them.

It's a good start, but there's always room for enhancements as 1)) recommended profiles, permitting applications that are part of the system;) the option to reject or deny unknown profiles within 30 seconds of timeout 3.) address blacklists and 4.) remove the log or limit it to only unique entries or only the last 50. Perhaps some suggestions or voice commands might help make it more user-friendly for those who are new to the system, too. Be careful

This is a perfect solution for what I need. I want to manage background apps while roaming and allow some apps to be allowed while others are not. This works. It could be useful to have an option for roaming columns (a mobile column that works for devices that are roaming) not only WiFi or cellular. I can switch it off and on when needed. It's a shame that those who leave negative reviews don't know that the restrictions on VPNs are within iOS and not in the application.