According to Neowin, Microsoft has killed the final method for activating Windows without an internet connection—that is, activation by telephone. It appears to have been discontinued a few days ago.
In a statement to Windows Latest, Microsoft confirmed that it retired the traditional Windows "telephone-based" activation ...
Phone activation for Windows has been discontinued. You'll have to use an online portal to activate Windows. The portal requires a Microsoft or business account. Microsoft has typically offered a few ...