Interesting. One extremely devoted fan of the old Fallout games have accomplished a pretty impressive task of making the old game work on a smartphone. They launched it on a pretty old by itself Lumia 950 XL. In order to pull it off, the fan had to use Windows 10 ARM, Windows OS version specifically made to work alongside ARM architecture processors. Video depicting this accomplishment can be watched here.

Personally I would rather not play that game on a small screen but hey, kudos for accomplishment.