In article ,
Martin Rich wrote:

My last sighting of an A/B button box in the UK was on the *North*
coast of Scotland - to similar astonishment - circa 1989: we were
definitely travelling in a car that I'd acquired in April 1988 so it
wasn't earlier than that.

I remember a news story about the last Button A/Button B phone being
decommissioned - I think it was in the early 1990s.

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