01438 Area Code — Stevenage, Knebworth & Watton at Stone
01438 is the UK dialling code for Stevenage in Hertfordshire, also serving Knebworth, Watton at Stone and Walkern, allocated by Ofcom under the National Telephone Numbering Plan. Our database has tracked 238 distinct 01438 numbers across 500 public lookups.
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Quick facts
Area code
01438
Location
Stevenage
County
Hertfordshire
Region
East of England
Number type
Geographic landline
Number format
01438 XXX XXX
Operators serving
8+
Call cost
Standard rate
About the 01438 dialling code
01438 is the UK geographic dialling code for Stevenage, allocated by Ofcom under the National Telephone Numbering Plan. It is used by landlines — and increasingly VoIP lines — registered to the Stevenage area.
A full Stevenage number is normally written as 01438 XXXXXX. You can dial the local part on its own from within the same area, or the full number from anywhere in the UK.
Because of UK number portability and internet calling, a 01438 number no longer guarantees the caller is physically in Stevenage. Fraudsters also "spoof" local codes like 01438 so an unknown call looks like a nearby business or neighbour — so treat an unexpected call on what is actually said, not on the area code alone.
Map of the 01438 dialling area
The marker shows Stevenage; the shaded circle is an approximate indication of the area the 01438 code serves — exact Ofcom charging-area boundaries are irregular and don't follow a neat radius.
Map data © OpenStreetMap contributors. View larger map
Areas typically served by 01438
Settlements in and around the Stevenage dialling area that typically use 01438 numbers. Approximate — Ofcom charging-area boundaries don't follow town or county lines exactly, and properties near a boundary may take a neighbouring code.
Calling 01438 from abroad
From outside the UK, dial your international access prefix, then the UK country code 44, then 1438 (the area code without its leading zero) and the local number.
| Calling from | Dial |
|---|---|
| United States & Canada | 011 44 1438 … |
| Europe / most of the world | 00 44 1438 … |
| Australia | 0011 44 1438 … |
| Any mobile phone | +44 1438 … |
History of the 01438 code
The code was 0438 until PhONEday, 16 April 1995, when a "1" was inserted after the leading zero to create 01438.
Top searched 01438 numbers
These are the 01438 numbers most-looked-up by visitors to our number checker. Click any number to see its full lookup page with risk-level, range holder, and community reports.
| Number | Searches | Last looked up |
|---|---|---|
| 01438 382071 | 40 | 10 Jul 2026 |
| 01438 382072 | 36 | 10 Jul 2026 |
| 01438 989277 | 31 | 9 Jul 2026 |
| 01438 989233 | 28 | 10 Jul 2026 |
| 01438 989214 | 18 | 10 Jul 2026 |
| 01438 989246 | 14 | 9 Jul 2026 |
| 01438 382070 | 13 | 10 Jul 2026 |
| 01438 989236 | 11 | 9 Jul 2026 |
| 01438 590149 | 7 | 2 Jul 2026 |
| 01438 989231 | 6 | 9 Jul 2026 |
| 01438 594408 | 5 | 4 Jul 2026 |
| 01438 381071 | 5 | 2 Jul 2026 |
| 01438 989303 | 5 | 29 Jun 2026 |
| 01438 904521 | 5 | 26 Jun 2026 |
| 01438 879643 | 5 | 16 Jun 2026 |
| 01438 344333 | 5 | 15 Jun 2026 |
| 01438 361027 | 4 | 10 Jul 2026 |
| 01438 814218 | 4 | 3 Jul 2026 |
| 01438 744190 | 4 | 6 Jun 2026 |
| 01438 989245 | 3 | 5 Jul 2026 |
Is a call from 01438 safe?
Most 01438 calls are ordinary local calls from Stevenage homes and businesses. The main risk to be aware of is "neighbour spoofing", where a scammer fakes a local 01438 prefix so you are more likely to answer. Never share bank details, passwords or one-time security codes with an unexpected caller, even when the number looks local — hang up and call the organisation back on a number you have verified yourself.
To call a 01438 (Stevenage) number from outside the UK, drop the leading zero and dial +44 1438 followed by the local number.
Operators serving Stevenage
These UK communications providers have been allocated 01438 number blocks by Ofcom. The number of blocks per operator gives a rough sense of how widely each provider serves this area.
| Provider (Ofcom-allocated) | Allocated blocks |
|---|---|
| BT | 24 |
| Vodafone Ltd (C&W) | 11 |
| 1XXXX | 10 |
| Sky UK Limited | 10 |
| Gamma Telecom Holdings Limited | 6 |
| TalkTalk Communications Limited | 5 |
| Virgin Media Limited | 4 |
| Colt Technology Services | 4 |
Ofcom number ranges on 01438
Ofcom's National Numbering Plan lists 424 number blocks under 01438, of which 179 are allocated to 108 communications providers. The first allocated blocks are shown below — look up any full number with the number checker to see its exact range holder.
| Number block | Status | Range holder (Ofcom-allocated) |
|---|---|---|
0143816… | Allocated | BT |
0143820… | Allocated | BT |
0143821… | Allocated | Virgin Media Limited |
0143822… | Allocated | Virgin Media Limited |
0143823… | Allocated | Virgin Media Limited |
0143824… | Allocated | Virgin Media Limited |
0143825… | Allocated | Redcentric Solutions Limited |
01438260… | Allocated | Vodafone Ltd (C&W) |
01438261… | Allocated | Vodafone Ltd (C&W) |
01438262… | Allocated | Vodafone Ltd (C&W) |
01438263… | Allocated | Vodafone Ltd (C&W) |
01438264… | Allocated | Vodafone Ltd (C&W) |
Showing 12 of 179 allocated blocks. Source: Ofcom telephone numbering data, updated weekly.
How to block and report 01438 spam calls
Block or report 01438
- You can block 01438 directly from your recent-calls list on iPhone or Android, and forward scam texts free to 7726.
- Scam or fraud calls should be reported to Action Fraud (0300 123 2040) or Police Scotland (101); persistent marketing calls to the ICO / TPS.
Full step-by-step instructions for every phone, network-level blocking and all UK reporting routes are in our guide: How to block and report unwanted calls in the UK.
How to stop unwanted calls for good
Blocking 01438 numbers stops that one number, but determined nuisance callers simply switch numbers. Silencing unknown callers, enabling your network's free spam shield and registering with the TPS cut the volume across the board — our canonical guide walks through each step: How to block and report unwanted calls in the UK.
Frequently asked questions about the 01438 code
Where is the 01438 area code?
The 01438 area code is allocated by Ofcom to Stevenage in Hertfordshire, United Kingdom. It is a geographic UK landline dialling code under the National Telephone Numbering Plan. The surrounding dialling area also takes in Knebworth, Watton at Stone, Walkern and nearby villages.
Is 01438 always a Stevenage number?
Numbers with the 01438 prefix were originally allocated by Ofcom to Stevenage. With UK number portability and VoIP allowing geographic relocation while keeping the same number, the call origin can differ from the original area, but the prefix's official assigned location remains Stevenage.
How do I block 01438 spam calls?
On iPhone, tap the (i) next to the number in Recents and choose Block this Caller. On Android, long-press the number in Recents and choose Block. To prevent unknown 01438 numbers ringing, enable Settings → Phone → Silence Unknown Callers (iPhone) or your dialler's spam filter (Android). Forward spam texts to 7726 free of charge.
How much does a 01438 call cost?
Calls to UK 01438 geographic numbers are charged at your provider's standard rate and are usually included in inclusive minutes on any modern landline or mobile plan.
Neighbouring dialling codes
Codes covering areas around Stevenage — useful when a caller is nearby but outside the 01438 boundary.
Living in or moving to Stevenage?
Our free postcode reports cover house prices, crime, broadband and schools for the districts around Stevenage.
Check another UK number
Have the full 10- or 11-digit number? The UK Phone Number Checker shows the Ofcom range holder, risk level, and any community reports for that specific number.