01277 Area Code
The dialling code for Brentwood: what 01277 numbers are, who holds them, and what to do about a call you don't recognise.
What Is the 01277 Area Code?
Brentwood landline number. 01277 is the dialling code for Brentwood. Numbers starting 01277 are landline numbers for that area. Internet phone services can use them too, so a caller is not necessarily in Brentwood.
Who was the range allocated to?
Ofcom has allocated 01277 numbers to 103 providers. The largest holders are BT, Vodafone Ltd (C&W) and TGL Services (UK) Ltd.
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 01277 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 01277 Range
| Number type | Brentwood landline number |
|---|---|
| Area | Brentwood |
| Number format | 01277 XXXXXX |
| Allocated by Ofcom | 54% of the range, to 103 providers |
| First allocation on record | 15 July 1994 |
| Most recent allocation | 18 June 2026 |
Largest holders of 01277 numbers
| Provider (as allocated by Ofcom) | Share of range | First allocated |
|---|---|---|
| BT | 22% | 15 July 1994 |
| Vodafone Ltd (C&W) | 2% | 24 July 2013 |
| TGL Services (UK) Ltd | 2% | 2 February 2015 |
| Virgin Media Limited | 2% | 28 June 2012 |
| Gamma Telecom Holdings Limited | 2% | 5 April 2004 |
| GCI Network Solutions Limited | 1% | 20 April 2017 |
97 more providers hold smaller blocks.
Allocation data: Ofcom numbering data, as published 28 October 2026.
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Common Questions About 01277 Numbers
Where is the 01277 area code?
01277 is the dialling code for Brentwood. Numbers starting 01277 are landline numbers for that area. Internet phone services can use them too, so a caller is not necessarily in Brentwood.
Is 01277 a mobile number?
No. 01277 is a landline (geographic) area code for Brentwood. UK mobile numbers start with 07.
Who does the 01277 range belong to?
Ofcom has allocated 01277 numbers to 103 providers. The largest holders are BT, Vodafone Ltd (C&W) and TGL Services (UK) Ltd. 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 01277 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 01277 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.