01558 Area Code — Llandeilo, UK

01558 is the UK dialling code for Llandeilo in Carmarthenshire, allocated by Ofcom under the National Telephone Numbering Plan. Our database has tracked 19 distinct 01558 numbers across 21 public lookups.

Quick facts

About the 01558 dialling code

01558 is the UK geographic dialling code for Llandeilo, allocated by Ofcom under the National Telephone Numbering Plan. It is used by landlines — and increasingly VoIP lines — registered to the Llandeilo area.

A full Llandeilo number is normally written as 01558 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 01558 number no longer guarantees the caller is physically in Llandeilo. Fraudsters also "spoof" local codes like 01558 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 01558 dialling area

The marker shows Llandeilo; the shaded circle is an approximate indication of the area the 01558 code serves — exact Ofcom charging-area boundaries are irregular and don't follow a neat radius.

Map data © OpenStreetMap contributors. View larger map

Calling 01558 from abroad

From outside the UK, dial your international access prefix, then the UK country code 44, then 1558 (the area code without its leading zero) and the local number.

History of the 01558 code

The code was 0558 until PhONEday, 16 April 1995, when a "1" was inserted after the leading zero to create 01558.

In the letter-dialling era the code had the mnemonic LL8 — on an old rotary dial, the letters LL (from Llandeilo) sat on the same holes as the digits 558, so subscribers literally dialled the start of the town's name.

Top searched 01558 numbers

These are the 01558 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.

Is a call from 01558 safe?

Most 01558 calls are ordinary local calls from Llandeilo homes and businesses. The main risk to be aware of is "neighbour spoofing", where a scammer fakes a local 01558 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 01558 (Llandeilo) number from outside the UK, drop the leading zero and dial +44 1558 followed by the local number.

Operators serving Llandeilo

These UK communications providers have been allocated 01558 number blocks by Ofcom. The number of blocks per operator gives a rough sense of how widely each provider serves this area.

Ofcom number ranges on 01558

Ofcom's National Numbering Plan lists 469 number blocks under 01558, of which 91 are allocated to 81 communications providers. The first allocated blocks are shown below — look up any full number with the number checker to see its exact range holder.

Showing 12 of 91 allocated blocks. Source: Ofcom telephone numbering data, updated weekly.

How to block and report 01558 spam calls

Block or report 01558

• You can block 01558 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.

Frequently asked questions about the 01558 code

Neighbouring dialling codes

Codes covering areas around Llandeilo — useful when a caller is nearby but outside the 01558 boundary.

Living in or moving to Llandeilo?

Our free postcode reports cover house prices, crime, broadband and schools for the districts around Llandeilo.

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.