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There are many websites that list a variety of servers that you can connect to.  Use Google to search for Minecraft servers that are compatible with Minecraft Bedrock Edition.  Minecraft Bedrock Edition is the version used on all mobile phones, Xbox One, Nintendo Switch, and Windows 10: Edition.  Some websites that list Minecraft Bedrock Servers include the following:  https://minecraftpocket-servers.com https://minecraft.gamepedia.com/Featured_servers https://mcpedl.com/servers/?cookie_check=1 If you aren't connecting to a pre-configured server, you'll need to know the server's address and port number.  Most web pages that list servers display the server address below the server banner.  To get the port number, you'll need to click on the banner or website URL for the server. Some websites will display Minecraft servers in "address:port" configuration (e.g., "play.avengetech.me:19132"). If so, exclude the colon from the address and use the number to the right of the colon as the port number. Tap the Minecraft app icon, which resembles a grassy block of dirt. You need to have a Microsoft account to play Minecraft online.  You can also use your Xbox Live account.  If you aren't logged into your Microsoft or Xbox Live account, do the following:  Tap Sign In on the left side of the screen. Tap your email address or tap Add an account. Enter the email address associated with your Microsoft account, then tap Next. Enter your Microsoft password, then tap Sign In. Tap Let's play to go back to the Minecraft title screen. It's the first option at the top of the Minecraft title screen. This tab is in the upper-right corner of the screen. The servers tab already has a few servers listed that anyone can join.  You can tap one of these servers to join, or continue to the next step to add a new server. It's at the top of the page. Doing so prompts a pop-up window. Use the first bar at the top of the screen to type the name of the server. Use the server address listed on the web page you got the server information from.  Type it in the "Server Address" bar. If the port number is not listed on the web page you got your server information from, click on the server banner or website URL to get the port number.  The most common port number for most Minecraft Bedrock Edition servers is 19132. It's the second option at the bottom of the screen.  This saves the server to your list of servers. Servers that you add are listed at the bottom of the "Servers" tab below "More Servers".  Tap any server in the list to connect to it. Some servers may not be operational all the time.
Look for a Minecraft Bedrock Edition server. Note the server's address and port number. Open Minecraft. Log in if necessary. Tap Play. Tap the Servers tab. Tap Add Server. Type the server name. Type the server address. Type the port number for the server. Tap Save. Tap the server.