01842 Area Code
The dialling code for Thetford: what 01842 numbers are, who holds them, and what to do about a call you don't recognise.
What Is the 01842 Area Code?
Thetford landline number. 01842 is the dialling code for Thetford. Numbers starting 01842 are landline numbers for that area. Internet phone services can use them too, so a caller is not necessarily in Thetford.
Who was the range allocated to?
Ofcom has allocated 01842 numbers to 91 providers. The largest holders are BT, Vodafone Ltd (C&W) and GCI Network Solutions Limited.
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 01842 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 01842 Range
| Number type | Thetford landline number |
|---|---|
| Area | Thetford |
| Number format | 01842 XXXXXX |
| Allocated by Ofcom | 45% of the range, to 91 providers |
| First allocation on record | 15 July 1994 |
| Most recent allocation | 26 January 2026 |
Largest holders of 01842 numbers
| Provider (as allocated by Ofcom) | Share of range | First allocated |
|---|---|---|
| BT | 9% | 15 July 1994 |
| Vodafone Ltd (C&W) | 2% | 6 September 2013 |
| GCI Network Solutions Limited | 2% | 2 May 2017 |
| Digital Space Group Limited | 1% | 23 May 2008 |
| Gamma Telecom Holdings Limited | 1% | 8 April 2005 |
| (Aq) Limited | 1% | 26 September 2012 |
85 more providers hold smaller blocks.
Allocation data: Ofcom numbering data, as published 28 October 2026.
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Common Questions About 01842 Numbers
Where is the 01842 area code?
01842 is the dialling code for Thetford. Numbers starting 01842 are landline numbers for that area. Internet phone services can use them too, so a caller is not necessarily in Thetford.
Is 01842 a mobile number?
No. 01842 is a landline (geographic) area code for Thetford. UK mobile numbers start with 07.
Who does the 01842 range belong to?
Ofcom has allocated 01842 numbers to 91 providers. The largest holders are BT, Vodafone Ltd (C&W) and GCI Network Solutions Limited. 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 01842 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 01842 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.