Fantastic tip - worked 100%.
New PC build with MSI motherboard,. Got stuck at the Windows 11 install screen 'waiting for network' - with 'no network found' (even though I had both hard wired ethernet cable + built in Wi-Fi - but clearly Windows had found no working driver for either. (and MSI had shipped motherboard drivers on a CD - in 2023! - that's just cheap and silly, as almost no one had CD drives now)
Anyway, Connected Samsung S21 phone to the PC via USB cable and put it in hotspot mode - found the USB hotspot mode switch (typically I hotspot via Wi-Fi - so had to look for the USB setting) but once selected - bingo - :-) hotspot network showed up on the 'stuck - waiting for network Windows install screen, and after than was able to complete install successfully.
Really don't understand why Microsoft do not have a 'no network found' option on that screen - there must be some many occasions with new motherboard or other hardware, where the right Wi-Fi or Ethernet driver has not bene installed and people to stuck at that screen!
(and I used to work for Microsoft, so usually I cut them some slack - but this current Windows 11 install process is just daft)