1) not all phones
2) chipsets in phones vary by where they are sold.
3) only exynos chipset phones are affected. in some economies. sold by some vendors. Not all models with a given name and code number (pixel 7, samsung 22) will be affected. "it depends"
4) not all manufacturers declare their chipset so
5) it is almost impossible for anyone but the cogniscenti to know if they are exposed to the problem, and a huge amount of FUD is flying around right now about exactly which models, which versions, which economy variants are affected, patched, can be patched, will be patched
6) the "turn off" button has been removed from some phones, presumably at the behest of the carriers to have to gatekeep VoLTE and VoWIFI and decide if they want it on or not, and do not always permit users to decide this for themselves.