Quote:
Originally Posted by Scott37
Just as I thought I understood this, I visited the Postal Museum and saw a few call boxes. I noticed this list of dialling codes. It appears they have 'redacted' the name of the local exchange though I assume it was to the north of London. As far as I can see, for a local number you dialled the number only (no code). How would the exchange know this was a local number? Nowadays all codes start with '0'. In earlier days of all-figure numbers I think they were '0', '8' or '9'. How did this previous system work? Did they have to find all the codes and exclude local numbers starting with the same digits, or did they take the first digit of the local numbers and make sure this was not used as the start of any code? How did this fit in with the idea of having meaningful codes?
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Incidentally, the notice is a reproduction that someone has made - As it refers to dialling from exchanges in the London Director Area , they all just dialled the seven digit number or the listed codes and numbers - no need to define the exchange. But at the bottom of the notice, it indicates that the notice was for 'Non-Director exchanges and UAXs' !! See a attached similar reproduction notice which has the top few lines correctly worded but still with the 'ND & UAXs' at the bottom.