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UK telephone exchange · Openreach stop-sell tracker

Llantrisant telephone exchange

Llantrisant and carries the Openreach exchange code SWLLO. Copper stop-sell restrictions have been in force here since 9 May 2023 (Tranche 8).

Stop-sell status

In force

since 9 May 2023

Exchange code

SWLLO

Tranche 8

Analogue switch-off (national)

31 Jan 2027

PSTN retirement — every UK exchange

What this means if you’re on the Llantrisant exchange

Openreach places an exchange on the FTTP priority list once full fibre reaches roughly 75% of the premises it serves. From the restriction date, any premises here that can order full fibre can no longer take out new copper services — analogue phone lines, FTTC broadband, working-line takeovers. Nothing is switched off on that date: existing lines keep working until your provider migrates you ahead of the national PSTN retirement on 31 January 2027.

When migration happens your number stays the same, and the local dialling code is unaffected — find it in the area-code index. If a call from an unfamiliar local number is what brought you here, run it through the lookup to see the Ofcom range holder and live reputation reports.

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FAQs about the Llantrisant exchange

Is the Llantrisant telephone exchange closing?

Llantrisant (code SWLLO) is on Openreach's FTTP priority stop-sell list — copper sales restrictions have applied since 9 May 2023. The building isn't shutting yet, but analogue (PSTN) service ends nationally on 31 January 2027, and premises with full fibre available here can no longer order new copper products.

What does stop sell at Llantrisant mean for my landline?

Existing services keep working — stop sell only blocks new supply of copper products (new analogue lines, copper broadband, transfers between providers on copper) at premises where full fibre is available. When your provider migrates you, your phone number stays the same and calls move to digital voice over broadband.

Which numbers come from the Llantrisant exchange?

Exchange serving areas don't map one-to-one onto dialling codes, but local landlines will use the geographic code for Llantrisant. Use the area-code index to find it, or look up a specific number to see its Ofcom range holder.

Source: Openreach FTTP Priority Exchange stop-sell ancillary document (© British Telecommunications plc), republished as facts with attribution. Dates reflect the most recent published document revision; always confirm migration plans with your own provider.