On Friday, 14 May 2021 at 13:55:02 UTC+1, NY wrote:


Apparently when the GPO started issuing phone numbers that were longer than
a couple of digits, they did some research and found that people could
remember chunks of either 2 or 3 digits, but a 4-digit chunk was harder to
remember.

Around thirty years ago, I moved to a house in a small town - and had a four-digit phone number. In itself, not a problem, but everyone else in the town only had three digit numbers. Others in the town would keep making mistakes and dropping one or other digit because they simply assumed all numbers had three digits.

Obviously all now long gone.