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Because you are still using a mobile/cell number to receive the call. WiFi exclusive calling is already free - it's called Zoom, or Skype, or Teams, or Discord,

• LinuxBender 4y ago
  Adding to this a more private and self hosted option, there is uMurmur [1] which is light-weight enough to run on a Linux home router. One of the mobile apps that works with it is Mumla. The downside of uMurmur is that the channel configuration is static. Upside is it takes a few minutes to get running and most of that is getting a LetsEncrypt cert. The voice quality is incredible. There is of course the full blown Murmur [2] install that works a little more like Discord in that people can create channels and there is a permission system. [1] - https://github.com/umurmur/umurmur/wiki/Configuration https://github.com/umurmur/umurmur/wiki/Configuration [2] - https://wiki.mumble.info/wiki/Main_Page https://wiki.mumble.info/wiki/Main_Page