UK area code
01558 area code — Llandeilo
01558 is Ofcom’s Llandeilo numbering area, in Carmarthenshire, Wales. 79 phone companies hold its 89 allocated number blocks. Its numbers are written like 01558 234 567. The nearest other codes are 01269 Ammanford (10 km) and 01550 Llandovery (18 km).
01558 at a glance
- Ofcom area name
- Llandeilo
- Council area
- Carmarthenshire
- Country
- Wales
- Number format
- 01558 234 567 (4+6)
- Local calls
- Full number recommended
- Current code since
- 1995 (previously 0558)
- Allocated blocks
- 89 of 469 (19%) across 79 providers
- Newest block
- 26 January 2026 (1 in the last 12 months)
Sources: Ofcom numbering data (weekly) and area-code list, Ofcom Numbering Plan, ONS geography.
If a 01558 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.
01558 history and number format
Number format: Numbers on 01558 use Ofcom's 4+6 format: the 5-digit code (including the leading 0) followed by a 6-digit local number — written like 01558 234 567.
Before 1995: 01558 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 0558.
Local dialling: Traditionally not from another 01558 landline, but it now depends on your provider: Ofcom stopped requiring providers to offer local (code-free) dialling on 11 March 2022. Dialling 01558 first always works, and mobiles always need it.
Allocation record: the oldest number block still visible on 01558 was allocated on 15 July 1994, and the most recent on 26 January 2026. 1 block was allocated in the last 12 months — newly-activated ranges with no call history, which is worth knowing when an unfamiliar 01558 number rings (see the weekly numbering changelog for every new allocation.)
Phone companies holding 01558 numbers
Every Ofcom range holder with blocks on 01558, 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 | 4 | 4 | 15 July 1994 | 15 July 1994 |
| Lumen Technologies UK Limited | 3 | 3 | 17 July 2006 | 17 July 2006 |
| Digital Space Group Limited | 2 | 2 | 14 May 2008 | 15 March 2016 |
| Fuse 2 Communications Ltd | 2 | 2 | 3 July 2017 | 22 January 2024 |
| GCI Network Solutions Limited | 2 | 2 | 2 May 2017 | 20 December 2023 |
| Mi Telecom Limited | 2 | 2 | 3 July 2020 | 6 July 2020 |
| TalkTalk Communications Limited | 2 | 2 | 20 January 2012 | 20 January 2012 |
| (AQ) LIMITED | 1 | 1 | 11 September 2012 | 11 September 2012 |
| 24 Seven Cloud Communications Ltd | 1 | 1 | 17 January 2020 | 17 January 2020 |
| 8x8 Communications UK Limited | 1 | 1 | 30 March 2012 | 30 March 2012 |
| AQL Wholesale Ltd | 1 | 1 | 3 January 2008 | 3 January 2008 |
| Adepteo Limited | 1 | 1 | 13 December 2016 | 13 December 2016 |
| Alnitak GmbH | 1 | 1 | 3 March 2017 | 3 March 2017 |
| Andrews & Arnold (Numbers) Ltd | 1 | 1 | 19 March 2009 | 19 March 2009 |
| Atomstream Limited | 1 | 1 | 12 May 2010 | 12 May 2010 |
| Barritel Limited | 1 | 1 | 15 August 2006 | 15 August 2006 |
| Bink Networks Ltd | 1 | 1 | 3 April 2023 | 3 April 2023 |
| CFL Communications Ltd | 1 | 1 | 13 July 2009 | 13 July 2009 |
| Colt Technology Services | 1 | 1 | 4 July 2016 | 4 July 2016 |
| Content Guru Limited | 1 | 1 | 12 October 2012 | 12 October 2012 |
| Convergence Group (wireless) Networks Limited | 1 | 1 | 21 May 2019 | 21 May 2019 |
| Dial 9 Communications Limited | 1 | 1 | 10 December 2019 | 10 December 2019 |
| Digitech Solutions Global Limited | 1 | 1 | 27 April 2010 | 27 April 2010 |
| EVE CONNECT LTD | 1 | 1 | 15 June 2022 | 15 June 2022 |
| Flextel Limited | 1 | 1 | 24 October 2005 | 24 October 2005 |
| Gamma Telecom Holdings Limited | 1 | 1 | 25 April 2005 | 25 April 2005 |
| Hello Telecom (UK) Limited | 1 | 1 | 11 November 2011 | 11 November 2011 |
| I.T Communications Limited | 1 | 1 | 25 April 2017 | 25 April 2017 |
| ICC Networks Ltd | 1 | 1 | 17 April 2012 | 17 April 2012 |
| ICUK Computing Services Limited | 1 | 1 | 20 September 2019 | 20 September 2019 |
Showing the 30 largest of 79 holders.
All number blocks on 01558first 200 of 469, by prefix
| Prefix | Status | Range holder |
|---|---|---|
| +44 155800 | Protected | — |
| +44 155801 | Protected | — |
| +44 155802 | Protected | — |
| +44 155803 | Protected | — |
| +44 155804 | Protected | — |
| +44 155805 | Protected | — |
| +44 155806 | Protected | — |
| +44 155807 | Protected | — |
| +44 155808 | Protected | — |
| +44 155809 | Protected | — |
| +44 155810 | Protected | — |
| +44 155811 | Protected | — |
| +44 155812 | Protected | — |
| +44 155813 | Protected | — |
| +44 155814 | Protected | — |
| +44 155815 | Protected | — |
| +44 155816 | Protected | — |
| +44 155817 | Protected | — |
| +44 155818 | Protected | — |
| +44 155819 | Protected | — |
| +44 1558200 | Protected | — |
| +44 1558201 | Protected | — |
| +44 1558202 | Protected | — |
| +44 1558203 | Protected | — |
| +44 1558204 | Protected | — |
| +44 1558205 | Protected | — |
| +44 1558206 | Protected | — |
| +44 1558207 | Protected | — |
| +44 1558208 | Protected | — |
| +44 1558209 | Protected | — |
| +44 1558210 | Protected | — |
| +44 1558211 | Protected | — |
| +44 1558212 | Protected | — |
| +44 1558213 | Protected | — |
| +44 1558214 | Protected | — |
| +44 1558215 | Protected | — |
| +44 1558216 | Protected | — |
| +44 1558217 | Protected | — |
| +44 1558218 | Protected | — |
| +44 1558219 | Protected | — |
| +44 155822 | Allocated | TelNG Limited |
| +44 155823 | Allocated | Localphone Limited |
| +44 155824 | Allocated | Redcentric Solutions Limited |
| +44 155825 | Protected | — |
| +44 155826 | Allocated | Voiceflex Limited |
| +44 1558270 | Protected | — |
| +44 1558271 | Protected | — |
| +44 1558272 | Protected | — |
| +44 1558273 | Protected | — |
| +44 1558274 | Protected | — |
| +44 1558275 | Protected | — |
| +44 1558276 | Protected | — |
| +44 1558277 | Allocated | Spitfire Network Services Limited |
| +44 1558278 | Protected | — |
| +44 1558279 | Protected | — |
| +44 155828 | Allocated | TTNC Limited |
| +44 155829 | Allocated | Nationwide Telephone Assistance Ltd |
| +44 155830 | Allocated | (AQ) LIMITED |
| +44 155831 | Allocated | AQL Wholesale Ltd |
| +44 1558320 | Protected | — |
| +44 1558321 | Protected | — |
| +44 1558322 | Protected | — |
| +44 1558323 | Protected | — |
| +44 1558324 | Protected | — |
| +44 1558325 | Protected | — |
| +44 1558326 | Protected | — |
| +44 1558327 | Protected | — |
| +44 1558328 | Allocated | TalkTalk Communications Limited |
| +44 1558329 | Allocated | TalkTalk Communications Limited |
| +44 155833 | Allocated | Net-Work Internet Ltd |
| +44 155834 | Allocated | VoIP-Un Limited |
| +44 155835 | Allocated | Telecom2 Limited |
| +44 155836 | Allocated | Digital Space Group Limited |
| +44 1558370 | Protected | — |
| +44 1558371 | Protected | — |
| +44 1558372 | Protected | — |
| +44 1558373 | Protected | — |
| +44 1558374 | Protected | — |
| +44 1558375 | Protected | — |
| +44 1558376 | Protected | — |
| +44 1558377 | Allocated | Digital Space Group Limited |
| +44 1558378 | Protected | — |
| +44 1558379 | Protected | — |
| +44 155838 | Allocated | Nodemax Limited |
| +44 155839 | Protected | — |
| +44 1558400 | Allocated | Voxbone SA |
| +44 1558401 | Protected | — |
| +44 1558402 | Protected | — |
| +44 1558403 | Protected | — |
| +44 1558404 | Protected | — |
| +44 1558405 | Protected | — |
| +44 1558406 | Protected | — |
| +44 1558407 | Protected | — |
| +44 1558408 | Protected | — |
| +44 1558409 | Protected | — |
| +44 155841 | Protected | — |
| +44 155842 | Allocated | Solutios Limited |
| +44 155843 | Quarantined | — |
| +44 155844 | Allocated | Mars Communications Limited |
| +44 155845 | Allocated | Andrews & Arnold (Numbers) Ltd |
| +44 155846 | Allocated | Nexus Telecommunications Limited |
| +44 155847 | Quarantined | — |
| +44 155848 | Protected | — |
| +44 155849 | Allocated | CFL Communications Ltd |
| +44 1558500 | Allocated | Digitech Solutions Global Limited |
| +44 1558501 | Allocated | YayYay Limited |
| +44 1558502 | Allocated | Atomstream Limited |
| +44 1558503 | Allocated | Telephone Box Limited |
| +44 1558504 | Allocated | GCI Network Solutions Limited |
| +44 1558505 | Allocated | Suretec Systems Ltd |
| +44 1558506 | Allocated | Telappliant Limited |
| +44 1558507 | Allocated | Inet Telecoms Ltd (Voipfone) |
| +44 1558508 | Allocated | Windsor Telecom Limited |
| +44 1558509 | Allocated | VoiceHost Limited |
| +44 1558510 | Protected | — |
| +44 1558511 | Allocated | Phone Co-Op Numbering Limited |
| +44 1558512 | Allocated | Invosys Limited |
| +44 1558513 | Protected | — |
| +44 1558514 | Allocated | INTELLIGENT EXCHANGES LIMITED |
| +44 1558515 | Allocated | Nexbridge Communications Limited |
| +44 1558516 | Protected | — |
| +44 1558517 | Allocated | Convergence Group (wireless) Networks Limited |
| +44 1558518 | Protected | — |
| +44 1558519 | Allocated | Alnitak GmbH |
| +44 155852 | Protected | — |
| +44 1558530 | Allocated | Invoco Ltd |
| +44 1558531 | Allocated | Hello Telecom (UK) Limited |
| +44 1558532 | Allocated | Internexus Networks Limited |
| +44 1558533 | Protected | — |
| +44 1558534 | Allocated | Simwood eSMS Limited |
| +44 1558535 | Allocated | 8x8 Communications UK Limited |
| +44 1558536 | Allocated | ICC Networks Ltd |
| +44 1558537 | Allocated | IOVOX Limited |
| +44 1558538 | Allocated | Ziron Limited |
| +44 1558539 | Protected | — |
| +44 1558540 | Allocated | Nuso Cloud UK Limited |
| +44 1558541 | Protected | — |
| +44 1558542 | Allocated | Kalnet4U Ltd |
| +44 1558543 | Allocated | Sky UK Limited |
| +44 1558544 | Allocated | Content Guru Limited |
| +44 1558545 | Allocated | Minotaur Telecom Limited |
| +44 1558546 | Allocated | Fuse 2 Communications Ltd |
| +44 1558547 | Allocated | Orbtalk Limited |
| +44 1558548 | Allocated | Redwood Technologies Ltd |
| +44 1558549 | Allocated | XoverX Ltd |
| +44 1558550 | Free | — |
| +44 1558551 | Allocated | Adepteo Limited |
| +44 1558552 | Allocated | Zapappi Ltd |
| +44 1558553 | Allocated | 24 Seven Cloud Communications Ltd |
| +44 1558554 | Allocated | I.T Communications Limited |
| +44 1558555 | Free | — |
| +44 1558556 | Allocated | IP Voice Networks Ltd |
| +44 1558557 | Allocated | Fuse 2 Communications Ltd |
| +44 1558558 | Allocated | Colt Technology Services |
| +44 1558559 | Allocated | Number Services Ltd. |
| +44 1558560 | Free | — |
| +44 1558561 | Free | — |
| +44 1558562 | Free | — |
| +44 1558563 | Protected | — |
| +44 1558564 | Protected | — |
| +44 1558565 | Protected | — |
| +44 1558566 | Protected | — |
| +44 1558567 | Protected | — |
| +44 1558568 | Protected | — |
| +44 1558569 | Protected | — |
| +44 1558570 | Allocated | ICUK Computing Services Limited |
| +44 1558571 | Allocated | SiPalto Ltd |
| +44 1558572 | Allocated | VOXYONDER NETWORK SERVICES UK LTD |
| +44 1558573 | Allocated | Bink Networks Ltd |
| +44 1558574 | Allocated | KCOM Group Ltd |
| +44 1558575 | Allocated | Dial 9 Communications Limited |
| +44 1558576 | Free | — |
| +44 1558577 | Allocated | EVE CONNECT LTD |
| +44 1558578 | Allocated | Mi Telecom Limited |
| +44 1558579 | Allocated | Mi Telecom Limited |
| +44 1558580 | Protected | — |
| +44 1558581 | Protected | — |
| +44 1558582 | Protected | — |
| +44 1558583 | Protected | — |
| +44 1558584 | Protected | — |
| +44 1558585 | Protected | — |
| +44 1558586 | Protected | — |
| +44 1558587 | Protected | — |
| +44 1558588 | Protected | — |
| +44 1558589 | Protected | — |
| +44 1558590 | Protected | — |
| +44 1558591 | Protected | — |
| +44 1558592 | Protected | — |
| +44 1558593 | Protected | — |
| +44 1558594 | Protected | — |
| +44 1558595 | Protected | — |
| +44 1558596 | Protected | — |
| +44 1558597 | Protected | — |
| +44 1558598 | Protected | — |
| +44 1558599 | Protected | — |
| +44 1558600 | Allocated | Linear Telecoms Limited |
| +44 1558601 | Protected | — |
| +44 1558602 | Protected | — |
| +44 1558603 | Protected | — |
| +44 1558604 | Protected | — |
Related lookups
- 01269 Ammanford10 km away
- 01550 Llandovery18 km away
- 01267 Carmarthen22 km away
- 01554 Llanelli25 km away
- BT4 allocated blocks on 01558
- Lumen Technologies UK Limited3 allocated blocks on 01558
- Digital Space Group Limited2 allocated blocks on 01558
- 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 01558
Where is area code 01558?
01558 is Ofcom's Llandeilo numbering area, in Carmarthenshire, Wales. Its exchange town is in Carmarthenshire. From abroad, drop the 0 and dial +44 1558.
Do I need to dial 01558 for a local call?
Traditionally not from another 01558 landline, but it now depends on your provider: Ofcom stopped requiring providers to offer local (code-free) dialling on 11 March 2022. Dialling 01558 first always works, and mobiles always need it.
How are 01558 numbers written?
Numbers on 01558 use Ofcom's 4+6 format: the 5-digit code (including the leading 0) followed by a 6-digit local number — written like 01558 234 567. From abroad the leading zero is dropped: +44 1558 then the local number.
What was the 01558 area code before?
01558 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 0558. Old signage or stationery showing 0558 refers to the same Llandeilo numbers.
Which phone companies hold 01558 numbers?
Ofcom lists 79 providers with allocated blocks on 01558. The largest are BT with 4 of the 89 allocated blocks, Lumen Technologies UK Limited with 3 of the 89 allocated blocks and Digital Space Group Limited with 2 of the 89 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 01558?
By distance between exchange towns, the nearest other codes are 01269 Ammanford (10 km), 01550 Llandovery (18 km), 01267 Carmarthen (22 km) and 01554 Llanelli (25 km).
How do I report a scam call from a 01558 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.