01923 Area Code
The dialling code for Watford: what 01923 numbers are, who holds them, and what to do about a call you don't recognise.
What Is the 01923 Area Code?
Watford landline number. 01923 is the dialling code for Watford. Numbers starting 01923 are landline numbers for that area. Internet phone services can use them too, so a caller is not necessarily in Watford.
Who was the range allocated to?
Ofcom has allocated 01923 numbers to 117 providers. The largest holders are BT, Virgin Media Limited and Vodafone Ltd (C&W).
Numbers can be moved (ported) between networks, so the network a caller uses today may not be the one Ofcom allocated the block to. The allocation does not identify the person or business using a number.
Had a call from a 01923 number you don't recognise?
We can't tell you who called: an area code only shows the type of number and the provider Ofcom allocated the range to.
- Don't call back in a hurry, even if a message says it's urgent. Never give bank details or security codes on a call you didn't expect.
- Block the number from your phone's recent calls list.
- Forward scam texts free to 7726. Report unwanted marketing calls to the ICO, and see Ofcom's advice on scam calls.
- Register your number with the Telephone Preference Service to opt out of sales calls.
About the 01923 Range
| Number type | Watford landline number |
|---|---|
| Area | Watford |
| Number format | 01923 XXXXXX |
| Allocated by Ofcom | 70% of the range, to 117 providers |
| First allocation on record | 15 July 1994 |
| Most recent allocation | 20 July 2026 |
Largest holders of 01923 numbers
| Provider (as allocated by Ofcom) | Share of range | First allocated |
|---|---|---|
| BT | 30% | 15 July 1994 |
| Virgin Media Limited | 8% | 16 May 1995 |
| Vodafone Ltd (C&W) | 7% | 20 June 2013 |
| Gamma Telecom Holdings Limited | 3% | 15 November 2012 |
| Sky UK Limited | 2% | 26 June 2013 |
| GCI Network Solutions Limited | 1% | 2 May 2017 |
111 more providers hold smaller blocks.
Allocation data: Ofcom numbering data, as published 28 October 2026.
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Common Questions About 01923 Numbers
Where is the 01923 area code?
01923 is the dialling code for Watford. Numbers starting 01923 are landline numbers for that area. Internet phone services can use them too, so a caller is not necessarily in Watford.
Is 01923 a mobile number?
No. 01923 is a landline (geographic) area code for Watford. UK mobile numbers start with 07.
Who does the 01923 range belong to?
Ofcom has allocated 01923 numbers to 117 providers. The largest holders are BT, Virgin Media Limited and Vodafone Ltd (C&W). Numbers can be moved (ported) between networks, so the network a caller uses today may not be the one Ofcom allocated the block to. The allocation does not identify the person or business using a number.
Who called me from a 01923 number?
We can't tell you who called. An area code only shows the type of number and which provider Ofcom allocated the range to. If you don't recognise a 01923 number, don't call back in a hurry, and never give out bank details or security codes on a call you didn't expect.
Block the number from your phone's recent calls list. Forward scam texts free to 7726, report unwanted marketing calls to the ICO, and see Ofcom's advice on scam calls.