TeamTalk is a free conferencing system available on the internet which (unlike big-tech services such as Zoom, Google Meet or Skype) gives its users full control. It supports audio and video.
If you don't have the TeamTalk client installed you can either download it from the website, or search your mobile device's app store for "TeamTalk". Once the client app is installed you should just be able to use the join link on this page to join. You can also manually enter server details, snide.fun for the address and default ports (10333 for both TCP and UDP).
This server's currently open to the public, but has some limits on what anonymous users can do. Users can create temporary channels (locked with passwords) for privacy, but please keep in mind this server is not encrypted. I hope you have fun using TeamTalk!