Chris1I called Orange FR customer support this morning (5 hours ago), got a "second level" tech, who said he was reactivating VoLTE function on my line and that it could take 24-48h to be effective.
As i said by PM to Kris_ASUS, i think my issue is due to Orange FR, which have a "weird" implementation of VoLTE.
lasiczecielskoThat's interesting. I'll insert my SIM to LG G7 and check if VoLTE will work, maybe somehow it has been dosabled for my number as in your case 😉
I'm also experiencing erratic experience with VoLTE and VoWiFi in Orange PL. I contacted customer support after firmware upgrade and my number had this option disabled. After operator updated state, it was working for a lets say a day and stopped. I called support again and they confirmed VoLTE/WiFi options went to disabled state somehow. Operator performed something called "SIM reset" asked me to turn off phone for a minute or two. If it doesn't solve problem suggested to open support request.
I'm testing right now.