As Sailfish X for Xperia 10II finally released, if you hadn't acquired device on the off chance before may have to get a SIM-locked variant. Whilst upon earlier Sony devices especially o2 in UK you were "stuffed", with advent of S1 network unlock tool I have satisfactorily managed "Bootloader Unlocked = YES upon Xperia X, XZ3 and now Xperia 10II; although latter requires input of bootloader code displayed in qUnlock tool NOT that obtained from Sony themselves.
Have to say had most difficulty in getting Xperia 10II into Bootloader mode and had to use to succeed.

Weren't they supposed to have done away with network locking?


Edit:
To answer my own question, in the UK the practice is to end in December 2021, but according to this [1] article O2 already only sell unlocked handsets




[1] https://www.bbc.co.uk/news/technology-54692179

Thanks for the heads-up, Xperia 10II in post was from Vodafone UK, so presumably no SIM lock will apply to newer devices going forward. However whether network devices have "Bootloader unlock allowed" may be a different matter.