Fibre to the Cabinet, Fibre to the Premises & Fibre on Demand services are available to customers connected to the Treharris exchange. Most customers can now upgrade from ADSL to fibre internet. BT Broadband is supplied via the Openreach Network. BT Broadband
| BT Product * | Speed | Reward Value ** | Deal Ends |
|---|---|---|---|
| Superfast Fibre 2 | 50-73Mbps | £60 BT Reward Card | 29th January 2026 |
| Full Fibre 150 | 150Mbps | £80 BT Reward Card | 29th January 2026 |
| Full Fibre 300 | 300Mbps | £85 BT Reward Card | 29th January 2026 |
| Full Fibre 500 | 500Mbps | £90 BT Reward Card | 29th January 2026 |
| Full Fibre 900 | 900Mbps | £160 BT Reward Card | 29th January 2026 |
* All packages on 24 Month Contract
** A BT Virtual Reward Card is a pre-loaded, digital Mastercard given as a bonus with certain BT broadband deals, allowing you to spend the loaded amount online or over the phone anywhere Mastercard is accepted, without waiting for a physical card. It functions like a prepaid debit card, with details (card number, CVV, expiry) accessed via your online BT account, and you typically claim it after your new service is fully installed and past the cooling-off period. Its value typically ranges from £50 to £150. To qualify for the card, you need to order a product or service from BT online.
Local Authority = Merthyr Tydfil County Borough Council
UK area dialling code (STD code) for the Treharris exchange is 01443
International dialling code for the Treharris exchange is +44 1443 or 0044 1443
The Treharris exchange is in the Pontypridd group of exchanges.
18 telephone exchanges form this regional grouping.
OS Grid Ref: ST 10123 97097
Located at :-
British Telecom,
Telephone Exchange,
Cardiff Road,
TREHARRIS.
CF46 5EY
/// what3words geocode = Prayers Trickster Pump
Treharris -> Merthyr Tydfil -> Wales
See Location Map Below
Openreach and the wider UK telecoms industry are retiring the old Public Switched Telephone Network (PSTN) and associated copper-based services as part of the move to an all-digital, internet-protocol (IP) based network.
The PSTN and associated wholesale copper services - including traditional analogue phone lines, ISDN2, ISDN30 and other legacy products - are being withdrawn.
These services historically relied on copper wiring connected from exchanges to premises. They will be replaced with digital alternatives such as Full Fibre (FTTP) and IP-based broadband services like SOGEA, SOGFAST and other All-IP products.
Originally planned for December 2025, the final withdrawal of the PSTN network has been rescheduled to 31 January 2027 to give more time for migration, particularly for vulnerable customers and specialist services. By this date, all legacy services that depend on the PSTN must be transitioned off the copper network.
Openreach have not identified the Treharris Exchange as a 'FTTP Priority Exchange' and the 'Stop Sell' date was September 2023.
Stop Sell is triggered when a majority (75%) of premises connected to a particular exchange can get ultrafast Full Fibre. Customers who then want to switch, upgrade or re-grade their broadband or phone service will have to take a new digital service over their new Full Fibre network.
