Pelephone - LTE/WCDMA network (No VoLTE)
Partner (ex Orange) - Global network (No VoLTE)
Need to try the mule method.
Roaming at Netherlands worked flawlessly for both SIMs, can't remember the networks.
Also it's not always possible to pull both keyboard and a phone.
I've worked on client's servers while being on the bus to airport, there is no way that I would manage to perform it with bluetooth keyboard.
Tried that, also with LDAC and other AptX variations, it's either falls back to SBC or got no sound at all.
But I still haven't seen confirmation that someone else got same behavior, so it might be limited only to my case.