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UK telephone exchange · Openreach stop-sell tracker

Hemel Hempstead telephone exchange

Hemel Hempstead and carries the Openreach exchange code SMHH. Copper stop-sell restrictions have been in force here since 14 February 2026 (Tranche 19).

Stop-sell status

In force

since 14 February 2026

Exchange code

SMHH

Tranche 19

Analogue switch-off (national)

31 Jan 2027

PSTN retirement — every UK exchange

What this means if you’re on the Hemel Hempstead 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 — local landlines here use the 01442 dialling code for Hemel Hempstead, which is unaffected by the switch-off. 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 Hemel Hempstead exchange

Is the Hemel Hempstead telephone exchange closing?

Hemel Hempstead (code SMHH) is on Openreach's FTTP priority stop-sell list — copper sales restrictions have applied since 14 February 2026. 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 Hemel Hempstead 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 Hemel Hempstead exchange?

Hemel Hempstead serves the Hemel Hempstead area, where landlines use the 01442 dialling code. Bear in mind UK numbers are portable, so a 01442 number no longer proves a physical line on this exchange — use the lookup to check any specific number.

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.