01438 Area Code
The dialling code for Stevenage: what 01438 numbers are, who holds them, and what to do about a call you don't recognise.
What Is the 01438 Area Code?
Stevenage landline number. 01438 is the dialling code for Stevenage. Numbers starting 01438 are landline numbers for that area. Internet phone services can use them too, so a caller is not necessarily in Stevenage.
Who was the range allocated to?
Ofcom has allocated 01438 numbers to 106 providers. The largest holders are BT, Vodafone Ltd (C&W) and Virgin Media 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 01438 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 01438 Range
| Number type | Stevenage landline number |
|---|---|
| Area | Stevenage |
| Number format | 01438 XXXXXX |
| Allocated by Ofcom | 54% of the range, to 106 providers |
| First allocation on record | 15 July 1994 |
| Most recent allocation | 17 March 2026 |
Largest holders of 01438 numbers
| Provider (as allocated by Ofcom) | Share of range | First allocated |
|---|---|---|
| BT | 20% | 15 July 1994 |
| Vodafone Ltd (C&W) | 5% | 2 September 2013 |
| Virgin Media Limited | 4% | 15 July 1994 |
| Gamma Telecom Holdings Limited | 2% | 16 February 2005 |
| GCI Network Solutions Limited | 1% | 25 April 2017 |
| AQL Wholesale Ltd | 1% | 1 November 2004 |
100 more providers hold smaller blocks.
Allocation data: Ofcom numbering data, as published 28 October 2026.
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Common Questions About 01438 Numbers
Where is the 01438 area code?
01438 is the dialling code for Stevenage. Numbers starting 01438 are landline numbers for that area. Internet phone services can use them too, so a caller is not necessarily in Stevenage.
Is 01438 a mobile number?
No. 01438 is a landline (geographic) area code for Stevenage. UK mobile numbers start with 07.
Who does the 01438 range belong to?
Ofcom has allocated 01438 numbers to 106 providers. The largest holders are BT, Vodafone Ltd (C&W) and Virgin Media 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 01438 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 01438 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.