The Domain Name System (DNS) is a hierarchical decentralized naming system for computers, services, or other resources connected to the Internet or a private network. It associates various information with domain names assigned to each of the participating entities. It translates more readily memorized domain names to the numerical IP addresses needed for locating and identifying computer services and devices with the underlying network protocols. By providing a worldwide, distributed directory service, the Domain Name System is an essential component of the functionality on the Internet, that has been in use since 1985.
The “address” of sites on the Web is actually a series of numbers, and DNS is how your browser converts these names into IP addresses. All your connections will use a DNS server provided by the ISP, but these might be slower or less reliable than certain third-party DNS options, such as Google DNS and Open DNS. Using these DNS servers can also help to access blocked websites. For these reasons, you should consider changing your DNS settings.
How to Change DNS Server on Android
Open the Wi-Fi settings on your device.
Now, open the network options for your Wi-Fi network. The way this works will depend on your phone; you may have to long-press the name of the Wi-Fi, and the tap on Modify Network, or there might be an arrow on the side, depending on your manufacturer and version of Android.
In the network details, scroll to the bottom, and tap on IP Settings. If you don’t see that menu, look for a button marked Advanced, and then you’ll see IP Settings.
Change this to static.
Change DNS1 and DNS2 to the settings you want.
For example, Google DNS is 220.127.116.11 and 18.104.22.168 respectively.