01848 Area Code — Thornhill, Caerphilly & Rhiwbina
01848 is the UK dialling code for Thornhill in Cardiff, also serving Caerphilly, Rhiwbina and Whitchurch, allocated by Ofcom under the National Telephone Numbering Plan. Our database has tracked 17 distinct 01848 numbers across 18 public lookups.
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Quick facts
Area code
01848
Location
Thornhill
County
Cardiff
Region
Wales
Number type
Geographic landline
Number format
01848 XXX XXX
Operators serving
8+
Call cost
Standard rate
About the 01848 dialling code
01848 is the UK geographic dialling code for Thornhill, allocated by Ofcom under the National Telephone Numbering Plan. It is used by landlines — and increasingly VoIP lines — registered to the Thornhill area.
A full Thornhill number is normally written as 01848 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 01848 number no longer guarantees the caller is physically in Thornhill. Fraudsters also "spoof" local codes like 01848 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 01848 dialling area
The marker shows Thornhill; the shaded circle is an approximate indication of the area the 01848 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 01848
Settlements in and around the Thornhill dialling area that typically use 01848 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 01848 from abroad
From outside the UK, dial your international access prefix, then the UK country code 44, then 1848 (the area code without its leading zero) and the local number.
| Calling from | Dial |
|---|---|
| United States & Canada | 011 44 1848 … |
| Europe / most of the world | 00 44 1848 … |
| Australia | 0011 44 1848 … |
| Any mobile phone | +44 1848 … |
History of the 01848 code
The code was 0848 until PhONEday, 16 April 1995, when a "1" was inserted after the leading zero to create 01848.
In the letter-dialling era the code had the mnemonic TH8 — on an old rotary dial, the letters TH (from Thornhill) sat on the same holes as the digits 848, so subscribers literally dialled the start of the town's name.
Top searched 01848 numbers
These are the 01848 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 |
|---|---|---|
| 01848 37084 | 2 | 1 Jul 2026 |
| 01848 335290 | 1 | 9 Jul 2026 |
| 01848 37119 | 1 | 29 Jun 2026 |
| 01848 37056 | 1 | 28 Jun 2026 |
| 01848 37048 | 1 | 28 Jun 2026 |
| 01848 37051 | 1 | 28 Jun 2026 |
| 01848 37114 | 1 | 28 Jun 2026 |
| 01848 37117 | 1 | 28 Jun 2026 |
| 01848 37049 | 1 | 28 Jun 2026 |
| 01848 37112 | 1 | 28 Jun 2026 |
| 01848 37057 | 1 | 28 Jun 2026 |
| 01848 37116 | 1 | 28 Jun 2026 |
| 01848 37055 | 1 | 28 Jun 2026 |
| 01848 37109 | 1 | 27 Jun 2026 |
| 01848 37115 | 1 | 27 Jun 2026 |
| 01848 37053 | 1 | 27 Jun 2026 |
| 01848 330588 | 1 | 17 Jun 2026 |
Is a call from 01848 safe?
Most 01848 calls are ordinary local calls from Thornhill homes and businesses. The main risk to be aware of is "neighbour spoofing", where a scammer fakes a local 01848 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 01848 (Thornhill) number from outside the UK, drop the leading zero and dial +44 1848 followed by the local number.
Operators serving Thornhill
These UK communications providers have been allocated 01848 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 |
|---|---|
| 1XXXX | 10 |
| Gamma Telecom Holdings Limited | 8 |
| BT | 6 |
| Digital Space Group Limited | 2 |
| Fuse 2 Communications Ltd | 2 |
| TalkTalk Communications Limited | 2 |
| Chess Limited | 2 |
| Minotaur Telecom Limited | 1 |
Ofcom number ranges on 01848
Ofcom's National Numbering Plan lists 469 number blocks under 01848, of which 98 are allocated to 82 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) |
|---|---|---|
0184820… | Allocated | BT |
0184821… | Allocated | Magrathea Telecommunications Limited |
01848240… | Allocated | Linear Telecoms Limited |
01848241… | Allocated | BT |
01848243… | Allocated | Minotaur Telecom Limited |
01848244… | Allocated | YayYay Limited |
01848245… | Allocated | Inet Telecoms Ltd (Voipfone) |
01848246… | Allocated | Internexus Networks Limited |
01848247… | Allocated | Bicom Systems EURL |
01848249… | Allocated | ICC Networks Ltd |
01848260… | Allocated | Gamma Telecom Holdings Limited |
01848261… | Allocated | Gamma Telecom Holdings Limited |
Showing 12 of 98 allocated blocks. Source: Ofcom telephone numbering data, updated weekly.
How to block and report 01848 spam calls
Block or report 01848
- You can block 01848 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 01848 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 01848 code
Where is the 01848 area code?
The 01848 area code is allocated by Ofcom to Thornhill in Cardiff, United Kingdom. It is a geographic UK landline dialling code under the National Telephone Numbering Plan. The surrounding dialling area also takes in Caerphilly, Rhiwbina, Whitchurch and nearby villages.
Is 01848 always a Thornhill number?
Numbers with the 01848 prefix were originally allocated by Ofcom to Thornhill. 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 Thornhill.
How do I block 01848 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 01848 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 01848 call cost?
Calls to UK 01848 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 Thornhill — useful when a caller is nearby but outside the 01848 boundary.
Living in or moving to Thornhill?
Our free postcode reports cover house prices, crime, broadband and schools for the districts around Thornhill.
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.