Use APKPure App
Get DNS Changer old version APK for Android
Use google DNS servers without root.Works on WIFI / 3G / 4G.
This app forces your device to use Google public DNS servers.
You don´t need root and it works on all connections (WIFI / 3G / 4G, etc...).
How does it work?
It creates a local VPN that will be used by all apps on the device and will use google DNS servers instead of your connection DNS.
The VPN does not connect to any remote server and exists only to override the default DNS servers.