Hi@all.
Did some testing with Drillisch o2 eSim to avoid incorrect results. All updates done previously.
As a second sim I used a Telekom Prepaid Card.
Results: VoLTE works perfect with T-Mobile.
Voicecalls in o2 network were with cut-offs and the other side could not understand me.
Turning off VoLTE solved it. But this is only a workaround, no solution.
And, I had to disable 5G.
Already wrote to the Support team.
Greetings,
Achim