We recommend only configuring Secure DNS on your iOS device, as not only is it a better option, it will also allow you to roam between networks without re-registering your IP address.
Modern version of iOS supports DNS-Over-HTTPs natively using profiles.
Download the relevant iOS profile:
In your "Settings", go to "Profile downloaded".
Tap on "Install" in the top right corner.
Older versions of iOS do not support Secure DNS, so the only way to configure ControlD on your phone is by installing our app.
We don't recommend using legacy UDP 53 DNS servers on iOS devices because it's not possible to change your DNS on cellular networks, and you will be forced to update it on every new Wi-Fi hotspot you encounter.