National Number Group
From Wikipedia, the free encyclopedia
The UK Public Switched Telephone Network is divided up by area into National Number Groups (NNG's), and then further divided up into dialling codes.
The structure of UK telephone numbers is a leading zero (replaced with +44 for international calls from outside the UK) followed by the NNG — a 3 or 4 digit dialling code (digits SAB or SABC in the example below) to different geographic areas of the UK.
eg.
- Telephone number 02078118055 is part of the "London Inner Area" and so has NNG 2078:
| 0 | S | A | B | C | D | E | F | G | H | I |
|---|---|---|---|---|---|---|---|---|---|---|
| 0 | 2 | 0 | 7 | 8 | 1 | 1 | 8 | 0 | 5 | 5 |
[edit] External links
- UK Phone Info maintains a full list of all NNGs
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