UK area code
01437 area code — Haverfordwest
01437 is Ofcom’s Haverfordwest numbering area, covering Clynderwen and Haverfordwest, in Pembrokeshire, Wales. 87 phone companies hold its 165 allocated number blocks. Its numbers are written like 01437 234 567. The nearest other codes are 01834 Narberth (5 km) and 01994 St Clears (17 km).
01437 at a glance
- Ofcom area name
- Haverfordwest
- Places on this code
- Clynderwen 014372 014373 014374 014375
- Haverfordwest 014376 014377 014378 014379
- Council area
- Pembrokeshire
- Country
- Wales
- Number format
- 01437 234 567 (4+6)
- Local calls
- Full number recommended
- Current code since
- 1995 (previously 0437)
- Allocated blocks
- 165 of 559 (30%) across 87 providers
- Newest block
- 26 January 2026 (2 in the last 12 months)
Sources: Ofcom numbering data (weekly) and area-code list, Ofcom Numbering Plan, ONS geography.
If a 01437 number called you
No clear pattern in reports for these numbers yet. If a call worried you:
- 1
Call back on a number you trust
If a caller says they're your bank, HMRC, a courier or a council, hang up and ring the organisation on the number from its website or your statement, never the number that called you. Caller ID can be faked.
- 2
Forward it to 7726
On a mobile, copy the caller's number from your recent calls and text it to 7726 (it spells SPAM). Scam texts can be forwarded to 7726 as they are. It's free, and your network uses the reports to investigate and block numbers.
- 3
Stop sales calls
Register your landline and mobile free with the Telephone Preference Service (0345 070 0707). Legitimate UK marketers must check it; calls should drop within 28 days. It won't stop scammers.
- 4
If you lost money or shared details
Call your bank on the number on your card (or 159 to reach most UK banks safely), then report it to Report Fraud online or on 0300 123 2040. Report Fraud replaced Action Fraud on 4 December 2025 for England, Wales and Northern Ireland; in Scotland call Police Scotland on 101.
01437 history and number format
Number format: Numbers on 01437 use Ofcom's 4+6 format: the 5-digit code (including the leading 0) followed by a 6-digit local number — written like 01437 234 567.
Before 1995: 01437 took its current form at PhONEday on 16 April 1995, when a "1" was inserted into every UK geographic code — before that the area dialled 0437.
Local dialling: Traditionally not from another 01437 landline, but it now depends on your provider: Ofcom stopped requiring providers to offer local (code-free) dialling on 11 March 2022. Dialling 01437 first always works, and mobiles always need it.
Allocation record: the oldest number block still visible on 01437 was allocated on 15 July 1994, and the most recent on 26 January 2026. 2 blocks were allocated in the last 12 months — newly-activated ranges with no call history, which is worth knowing when an unfamiliar 01437 number rings (see the weekly numbering changelog for every new allocation.)
Phone companies holding 01437 numbers
Every Ofcom range holder with blocks on 01437, by allocated blocks. The holder is the company Ofcom allocated the block to; a number can since have been ported to another provider (see range holder vs current provider).
| Range holder | Allocated | All blocks | First block | Latest block |
|---|---|---|---|---|
| BT | 14 | 14 | 15 July 1994 | 19 February 2024 |
| Gamma Telecom Holdings Limited | 10 | 10 | 9 October 2008 | 22 September 2021 |
| Magrathea Telecommunications Limited | 7 | 7 | 24 September 2004 | 16 November 2011 |
| TalkTalk Communications Limited | 4 | 4 | 28 August 2007 | 13 February 2013 |
| Fuse 2 Communications Ltd | 3 | 3 | 4 July 2017 | 22 January 2024 |
| Resilient Limited | 3 | 3 | 18 May 2012 | 18 May 2012 |
| Served Up Limited | 3 | 3 | 23 May 2008 | 1 March 2013 |
| Sky UK Limited | 3 | 3 | 30 July 2014 | 20 November 2018 |
| 24 Seven Cloud Communications Ltd | 2 | 2 | 17 January 2020 | 17 January 2020 |
| Adepteo Limited | 2 | 2 | 13 October 2016 | 13 October 2016 |
| Atomstream Limited | 2 | 2 | 22 March 2010 | 22 March 2010 |
| Barritel Limited | 2 | 2 | 7 June 2007 | 3 August 2011 |
| Bicom Systems EURL | 2 | 2 | 2 March 2012 | 2 March 2012 |
| Bink Networks Ltd | 2 | 2 | 29 March 2023 | 3 April 2023 |
| Dial 9 Communications Limited | 2 | 2 | 10 December 2019 | 10 December 2019 |
| Digital Space Group Limited | 2 | 2 | 30 November 2007 | 15 March 2016 |
| GCI Network Solutions Limited | 2 | 2 | 25 April 2017 | 20 December 2023 |
| I.T Communications Limited | 2 | 2 | 25 April 2017 | 5 September 2019 |
| ICUK Computing Services Limited | 2 | 2 | 17 June 2020 | 23 November 2022 |
| INTELLIGENT EXCHANGES LIMITED | 2 | 2 | 26 January 2026 | 26 January 2026 |
| IOVOX Limited | 2 | 2 | 3 July 2012 | 22 August 2013 |
| IP Voice Networks Ltd | 2 | 2 | 22 August 2017 | 20 September 2017 |
| Inet Telecoms Ltd (Voipfone) | 2 | 2 | 30 November 2009 | 28 January 2015 |
| Internexus Networks Limited | 2 | 2 | 21 November 2011 | 21 November 2011 |
| Invosys Limited | 2 | 2 | 26 January 2012 | 20 April 2017 |
| KCOM Group Ltd | 2 | 2 | 8 September 2022 | 8 September 2022 |
| Kalnet4U Ltd | 2 | 2 | 20 May 2013 | 21 March 2016 |
| Linear Telecoms Limited | 2 | 2 | 8 October 2010 | 8 October 2010 |
| Localphone Limited | 2 | 2 | 3 May 2007 | 3 May 2007 |
| M247 Ltd | 2 | 2 | 29 May 2015 | 29 May 2015 |
Showing the 30 largest of 87 holders.
All number blocks on 01437first 200 of 559, by prefix
| Prefix | Status | Range holder |
|---|---|---|
| +44 143700 | Protected | — |
| +44 143701 | Protected | — |
| +44 143702 | Protected | — |
| +44 143703 | Protected | — |
| +44 143704 | Protected | — |
| +44 143705 | Protected | — |
| +44 143706 | Protected | — |
| +44 143707 | Protected | — |
| +44 143708 | Protected | — |
| +44 143709 | Protected | — |
| +44 143710 | Protected | — |
| +44 143711 | Protected | — |
| +44 143712 | Protected | — |
| +44 143713 | Protected | — |
| +44 143714 | Protected | — |
| +44 143715 | Protected | — |
| +44 143716 | Protected | — |
| +44 143717 | Protected | — |
| +44 143718 | Protected | — |
| +44 143719 | Protected | — |
| +44 1437200 | Allocated | Inet Telecoms Ltd (Voipfone) |
| +44 1437201 | Protected | — |
| +44 1437202 | Protected | — |
| +44 1437203 | Allocated | Atomstream Limited |
| +44 1437204 | Allocated | Suretec Systems Ltd |
| +44 1437205 | Allocated | Calltracks Limited |
| +44 1437206 | Allocated | GCI Network Solutions Limited |
| +44 1437207 | Allocated | TGL Services (UK) Ltd |
| +44 1437208 | Allocated | VoiceHost Limited |
| +44 1437209 | Allocated | Invosys Limited |
| +44 1437210 | Protected | — |
| +44 1437211 | Allocated | YayYay Limited |
| +44 1437212 | Allocated | M247 Ltd |
| +44 1437213 | Allocated | Barritel Limited |
| +44 1437214 | Allocated | TalkTalk Communications Limited |
| +44 1437215 | Protected | — |
| +44 1437216 | Allocated | Internexus Networks Limited |
| +44 1437217 | Allocated | Bicom Systems EURL |
| +44 1437218 | Allocated | 8x8 Communications UK Limited |
| +44 1437219 | Allocated | ICC Networks Ltd |
| +44 1437220 | Allocated | Content Guru Limited |
| +44 1437221 | Allocated | Minotaur Telecom Limited |
| +44 1437222 | Protected | — |
| +44 1437223 | Allocated | Media Hawk Ltd |
| +44 1437224 | Allocated | Simwood eSMS Limited |
| +44 1437225 | Allocated | Fuse 2 Communications Ltd |
| +44 1437226 | Allocated | Number Services Ltd. |
| +44 1437227 | Allocated | Nuso Cloud UK Limited |
| +44 1437228 | Allocated | Kalnet4U Ltd |
| +44 1437229 | Allocated | IOVOX Limited |
| +44 1437230 | Protected | — |
| +44 1437231 | Allocated | EVE CONNECT LTD |
| +44 1437232 | Allocated | Zapappi Ltd |
| +44 1437233 | Protected | — |
| +44 1437234 | Allocated | IP Voice Networks Ltd |
| +44 1437235 | Allocated | Sky UK Limited |
| +44 1437236 | Allocated | DIDWW Ireland Limited |
| +44 1437237 | Allocated | Adepteo Limited |
| +44 1437238 | Allocated | I.T Communications Limited |
| +44 1437239 | Allocated | Fuse 2 Communications Ltd |
| +44 1437240 | Allocated | Vodafone Ltd (C&W) |
| +44 1437241 | Allocated | 24 Seven Cloud Communications Ltd |
| +44 1437242 | Allocated | SiPalto Ltd |
| +44 1437243 | Allocated | Mi Telecom Limited |
| +44 1437244 | Allocated | Six Degrees Technology Group Limited |
| +44 1437245 | Allocated | INTELLIGENT EXCHANGES LIMITED |
| +44 1437246 | Allocated | KCOM Group Ltd |
| +44 1437247 | Free | — |
| +44 1437248 | Free | — |
| +44 1437249 | Free | — |
| +44 1437250 | Allocated | Dial 9 Communications Limited |
| +44 1437251 | Free | — |
| +44 1437252 | Allocated | VOXYONDER NETWORK SERVICES UK LTD |
| +44 1437253 | Free | — |
| +44 1437254 | Free | — |
| +44 1437255 | Allocated | Bink Networks Ltd |
| +44 1437256 | Free | — |
| +44 1437257 | Allocated | ICUK Computing Services Limited |
| +44 1437258 | Allocated | Belgacom International Carrier Services SA |
| +44 1437259 | Free | — |
| +44 1437260 | Protected | — |
| +44 1437261 | Protected | — |
| +44 1437262 | Protected | — |
| +44 1437263 | Protected | — |
| +44 1437264 | Protected | — |
| +44 1437265 | Protected | — |
| +44 1437266 | Protected | — |
| +44 1437267 | Protected | — |
| +44 1437268 | Protected | — |
| +44 1437269 | Protected | — |
| +44 1437270 | Protected | — |
| +44 1437271 | Protected | — |
| +44 1437272 | Protected | — |
| +44 1437273 | Protected | — |
| +44 1437274 | Protected | — |
| +44 1437275 | Protected | — |
| +44 1437276 | Protected | — |
| +44 1437277 | Protected | — |
| +44 1437278 | Protected | — |
| +44 1437279 | Protected | — |
| +44 1437280 | Protected | — |
| +44 1437281 | Protected | — |
| +44 1437282 | Protected | — |
| +44 1437283 | Protected | — |
| +44 1437284 | Protected | — |
| +44 1437285 | Protected | — |
| +44 1437286 | Protected | — |
| +44 1437287 | Protected | — |
| +44 1437288 | Protected | — |
| +44 1437289 | Protected | — |
| +44 1437290 | Protected | — |
| +44 1437291 | Protected | — |
| +44 1437292 | Protected | — |
| +44 1437293 | Protected | — |
| +44 1437294 | Protected | — |
| +44 1437295 | Protected | — |
| +44 1437296 | Protected | — |
| +44 1437297 | Protected | — |
| +44 1437298 | Protected | — |
| +44 1437299 | Protected | — |
| +44 1437300 | Protected | — |
| +44 1437301 | Protected | — |
| +44 1437302 | Protected | — |
| +44 1437303 | Protected | — |
| +44 1437304 | Protected | — |
| +44 1437305 | Protected | — |
| +44 1437306 | Protected | — |
| +44 1437307 | Protected | — |
| +44 1437308 | Protected | — |
| +44 1437309 | Protected | — |
| +44 1437310 | Protected | — |
| +44 1437311 | Protected | — |
| +44 1437312 | Protected | — |
| +44 1437313 | Protected | — |
| +44 1437314 | Protected | — |
| +44 1437315 | Protected | — |
| +44 1437316 | Protected | — |
| +44 1437317 | Protected | — |
| +44 1437318 | Protected | — |
| +44 1437319 | Protected | — |
| +44 1437320 | Protected | — |
| +44 1437321 | Protected | — |
| +44 1437322 | Protected | — |
| +44 1437323 | Protected | — |
| +44 1437324 | Protected | — |
| +44 1437325 | Protected | — |
| +44 1437326 | Protected | — |
| +44 1437327 | Protected | — |
| +44 1437328 | Protected | — |
| +44 1437329 | Protected | — |
| +44 1437330 | Protected | — |
| +44 1437331 | Protected | — |
| +44 1437332 | Protected | — |
| +44 1437333 | Protected | — |
| +44 1437334 | Protected | — |
| +44 1437335 | Protected | — |
| +44 1437336 | Protected | — |
| +44 1437337 | Protected | — |
| +44 1437338 | Protected | — |
| +44 1437339 | Protected | — |
| +44 1437340 | Protected | — |
| +44 1437341 | Protected | — |
| +44 1437342 | Protected | — |
| +44 1437343 | Protected | — |
| +44 1437344 | Protected | — |
| +44 1437345 | Protected | — |
| +44 1437346 | Protected | — |
| +44 1437347 | Protected | — |
| +44 1437348 | Protected | — |
| +44 1437349 | Protected | — |
| +44 1437350 | Protected | — |
| +44 1437351 | Protected | — |
| +44 1437352 | Protected | — |
| +44 1437353 | Protected | — |
| +44 1437354 | Protected | — |
| +44 1437355 | Protected | — |
| +44 1437356 | Protected | — |
| +44 1437357 | Protected | — |
| +44 1437358 | Protected | — |
| +44 1437359 | Protected | — |
| +44 1437360 | Protected | — |
| +44 1437361 | Protected | — |
| +44 1437362 | Protected | — |
| +44 1437363 | Protected | — |
| +44 1437364 | Protected | — |
| +44 1437365 | Protected | — |
| +44 1437366 | Protected | — |
| +44 1437367 | Protected | — |
| +44 1437368 | Protected | — |
| +44 1437369 | Protected | — |
| +44 1437370 | Protected | — |
| +44 1437371 | Protected | — |
| +44 1437372 | Protected | — |
| +44 1437373 | Protected | — |
| +44 1437374 | Protected | — |
| +44 1437375 | Protected | — |
| +44 1437376 | Protected | — |
| +44 1437377 | Protected | — |
| +44 1437378 | Protected | — |
| +44 1437379 | Protected | — |
Related lookups
- 01834 Narberth5 km away
- 01994 St Clears17 km away
- 01348 Fishguard24 km away
- 01646 Milford Haven25 km away
- BT14 allocated blocks on 01437
- Gamma Telecom Holdings Limited10 allocated blocks on 01437
- Magrathea Telecommunications Limited7 allocated blocks on 01437
- All UK towns A–ZDialling codes by town
- More Wales codesSame region
- All UK area codesBrowse every 01/02 dialling code
- Lookup any UK numberFree reverse phone lookup
- UK area codes explainedCornerstone guide
- 020 London numbers explainedCornerstone guide
- 0330 numbers explainedCornerstone guide
- How Ofcom allocates UK phone numbersCornerstone guide
FAQs about 01437
Where is area code 01437?
01437 is Ofcom's Haverfordwest numbering area, in Pembrokeshire, Wales. Its exchange towns are in Pembrokeshire. From abroad, drop the 0 and dial +44 1437.
Which places use the 01437 code?
Ofcom splits 01437 into 2 areas by the first digit of the local number: Clynderwen (014372, 014373, 014374, 014375); Haverfordwest (014376, 014377, 014378, 014379).
Do I need to dial 01437 for a local call?
Traditionally not from another 01437 landline, but it now depends on your provider: Ofcom stopped requiring providers to offer local (code-free) dialling on 11 March 2022. Dialling 01437 first always works, and mobiles always need it.
How are 01437 numbers written?
Numbers on 01437 use Ofcom's 4+6 format: the 5-digit code (including the leading 0) followed by a 6-digit local number — written like 01437 234 567. From abroad the leading zero is dropped: +44 1437 then the local number.
What was the 01437 area code before?
01437 took its current form at PhONEday on 16 April 1995, when a "1" was inserted into every UK geographic code — before that the area dialled 0437. Old signage or stationery showing 0437 refers to the same Haverfordwest numbers.
Which phone companies hold 01437 numbers?
Ofcom lists 87 providers with allocated blocks on 01437. The largest are BT with 14 of the 165 allocated blocks, Gamma Telecom Holdings Limited with 10 of the 165 allocated blocks and Magrathea Telecommunications Limited with 7 of the 165 allocated blocks. Numbers can be ported, so a number's current provider may differ from the block's holder.
Which area codes are next to 01437?
By distance between exchange towns, the nearest other codes are 01834 Narberth (5 km), 01994 St Clears (17 km), 01348 Fishguard (24 km) and 01646 Milford Haven (25 km).
How do I report a scam call from a 01437 number?
On a mobile, text the caller's number to 7726 (free). If you lost money or shared details, call your bank and report it to Report Fraud (0300 123 2040), which replaced Action Fraud in December 2025. Unwanted sales calls go to the ICO after registering with the Telephone Preference Service.