Hidden Valley (1932) BOB STEELE 

All those things were in use by the end of WWI, while the West was still The West. There were a LOT of Westerns made showing the Western Cowboys fighting against NAZIS using Ham Radios and Airplanes - and the cowboys mostly on horseback, living near Old Western towns which had telephone service. I haven't seen any of those in 3-5 Decades, myself.

No.

In 1932, not very much at all. Certainly not much by today's standards - it was "free" advertising for Goodyear.

and cars too.13:22

Steele says early in the flick "this is the 20th century". Lot of westerns from this era feature cars, planes and telephones. So I guess the wild west lasted longer than we imagine, at least in Hollywood.