The app includes other features such as a full log of DNS queries, notification on block events, and encryption (using DNS-over-TLS) of all queries to the Quad9 systems.
Find the “Quad9 Connect” app on the Google Play store:
It is also possible to use Quad9 services using the Private DNS feature of Android, click here to find out how to do it.
DNSCrypt configuration options
DNSCrypt is a less frequently used DNS encryption protocol, but it is supported by Quad9. To read more about DNSCrypt, see our post here, or you may download the configuration files and stamps by following https://www.quad9.net/quad9-resolvers.toml