Call vibration can't be disabled

This is annoying as hell. For example being in movies, and the damn phone is vibrating and making noises regardless if you have it silent or what the vibration settings are.

I’ve tried from settings all the alternatives “Vibration only when sounds on”, “Vibration never” etc. But no.

This has been across many OS updates on Xperia 10 II. So I suspect maybe something is wrong with my own phone environment? Any idea how I could fix it myself? I haven’t done anything odd with my phone.