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Wifi calling not working with specific carrier

  • /e/ version: 2.7
  • Device model(s): tetris (Nothing CMF Phone 1)
  • Developer mode enabled: yes
  • Device rooted: no
  • Trackers blocker enabled: yes, but not for dialer app.

Problem Details

  • Wifi calling is not working with the Carrier "sim.de".
  • I did some more research, and the proper MNC of sim.de (Drillisch) is 23.
  • They operate in the network of “1&1” (Name of the Carrier).
  • But “1&1” doesnt have full network coverage in Germany yet, so they also use the Networks of "O2" (MNC 03) and/or Vodafone (MNC 02). Probably Roaming is used for that?

I can provide more specific information if needed. (But right now i dont know what exactly you would probably need)