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Portsmouth changed its area code from 01705 to 023 during the year 2000.

At the same time, the six-digit local numbers in use in Portsmouth were prefixed with '92' to make them eight digits long. For example, (01705) 822251 changed to (023) 9282 2251.

Southampton also uses the area code 023 and you can dial between the two cities without using the code. However, each city officially has its own block of numbers:

  • Local numbers beginning with "9" are for Portsmouth.

    That's numbers from (023) 9000 0000 to 9989 9999.

  • Local numbers beginning with "8" are for Southampton.

    That's numbers from (023) 8000 0000 to 8999 9999.

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Q: When did Portsmouth area telephone numbers change to 023?
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