Problems
The continued operation of the system presented a number of problems. With the growth of subscriber dialled international calls from abroad and the incompatible allocation of letters to numbers on foreign dials, there was an increase in the number of dialling errors. In London the number of three letter codes that could be used to represent exchanges had been exhausted. Significant changes were planned to the way calls in and out of the London telephone area were to be handled that required exchange codes to be grouped together into sectors and it was not possible to implement these changes without a transition to all-figure dialling. The General Post Office produced a pamphlet All-Figure Telephone Numbers in 1965 which summarised the problems.
Read more about this topic: All-figure Dialling
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