Xperia 10 III, 4.5.0.24, FI Elisa, 4G usually hard, 2G never, "VoLTE" calls only

I had a problem in munich airport not getting connection at all, no mobile data, no sms, nothing…

After I did that “ofono removal and reboot” i got 4g briefly but then lost it
– and finally I noticed the case was after I enabled mobile data roaming things broke.

(There is 'NO roaming for mobile internet connection" thread where I comment more of that)

And now, at home network I also have mobile data roaming disabled – and 4G is not so hard anymore.

2G is still never.

The interesting thing, probably coincidence, is that wherever there is no 3G network I have these problems. When I was in Austria, phone connected to 3G and 4G networks “as it used to be”. Here in Finland, there i Munich airport and last summer in Crete I never saw 3G networks (in ui, or in cellmon)… but I wonder how on earth that could make a difference…