A free app for Android, by Metadisk.

The DNS Changer: No Root offers a fast and reliable way to change your DNS. This app allows you to see the speed of your connection, the speed of the server, and also allows you to choose the server that you want to use to browse the web.

The app will only take up a small space on your device. This app can be used on any Android device. It is free to use, and you can choose to add your own custom DNS server and save it for later use. It is fast and efficient to use.