This setup became something of a de facto standard, and virtually every wall-mount phone sold in the US has the mounting points matching the spacing of those original studs from 1965, though most use a short cable to plug in rather than a bound one like from the original Trimline.
So that's what he's talking about.
FWIW, there's no such standard, de facto or otherwise, in the UK that I know of. Wall-mounting a phone means drilling holes for wallplugs and screws matching whatever keyholes are in the back of the phone -- and then having a trailing cable to wherever it plugs in. This is, of course, much less neat and tidy than the US system. Modern phones that need a power cable as well as the phone cable, are even less neat and tidy.
Peter
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