Apparently SFOS 4.5 provides more problems with the hot-spot. Previously, I only had problems with the Xperia 10 iii and Congstar SIM, while Xperia 10 iii with Vodafone (Germany) SIM was giving me Internet access via a tethered connection.
Now I observe the same problems I previously only had with Congstar also with Vodafone SIM in the Xperia 10 iii.
I haven’t checked with the Xperia 10ii yet but will do so soon. Until now (i.e. until SFOS 4.4), I had now problems with the Xperia 10ii and any SIM