I have written a configuration profile. This means that all DNS requests on your iPhone/iPad/iPod Touch are routed via AdGuard DNS-over-TLS.
With this configuration profile you block a large part of advertising on your device.
After downloading the file, you have to unzip and open it. Now you will get a message that a profile has been loaded.
Open your settings --> profile loaded ->> install. Now you have to enter your code to confirm. Then go to Install.
Under Settings ->> VPN and Network you will now find DNS AdGuard DNS-over-TLS which is also directly activated.
You could check this on https://www.dnsleaktest.com/ just choose the standard test.
This now spits out IP, hostname, ISP and country from your DNS server AdGuard.
Here is the link to https://adguard.com/
If you want to delete the configuration profile, you can remove it via Settings --> General --> Profile --> AdGuard DNS-over-TLS --> profile and delete.