National Number Group
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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[1].
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 2, 3, 4 or 5 digit dialling code (digits SA in the example below) to different geographic areas of the UK.
e.g.
- Telephone number (020) 7811 8055 is part of the "London 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 |
References
[edit]- ↑ "Telecoms numbering". www.ofcom.org.uk. 28 April 2010. Retrieved 3 September 2026.
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