That's interesting. Out of interest is the IP you get a 3 IP (if you check websites like ipinfo.io what does it show for ISP). Also does it show 3 as the provider of the eSIM, or does it show a different company? I don't mean the displayed network name but rather the name of the SIM provider (on iOS this is displayed at the top of the eSIM details screen).
The one odd thing I saw about roaming is they have instructions for manually changing the APN to "basic-data":
https://support.ymobile.co.uk/hc/en...049-Setting-Up-APN-for-Roaming-on-Your-Device
They even quite radically suggest resetting your full network settings on iOS to reset to default once you return to the UK (which is rather silly as there's even an option in Mobile Data options just to reset the APN). So I have a feeling roaming might be through someone else like Tele2.
I'd also be interested to know if it gets similar speeds to 3 as well. I might have a go myself soon but I'd likely cancel before the free month is up as I don't need another mobile subscription really.