TL;DR: The UK's analogue phone network shuts off on 31 January 2027 — around 7 months from today. Openreach is permanently retiring the PSTN (Public Switched Telephone Network) on 31 January 2027 — the deadline is locked and won't be delayed again. Legacy line rental prices are rising in three steps through 2026, effectively doubling by October. Businesses that do nothing risk being defaulted to a basic emergency-only fallback with no normal calling ability. Moving to a cloud-based VoIP system now avoids the price hikes and gives you time for a smooth, planned migration.