BT outlines plans for PSTN switch-over and protective migrations

BT Business has announced the UK’s copper PSTN will be retired at the end of January 2027 and the company is stepping up protective migrations to move remaining PSTN customers to All‑IP.

• Main action: BT is proactively carrying out protective migrations, automatically upgrading analogue services to digital where possible; as of January 2026 around 80% of BT’s voice customers have moved to All‑IP services and BT says it has invested billions of pounds in nationwide full‑fibre networks to enable the transition. The company will provide a limited basic voice service for CNI lines after January 2027 while urging organisations to engage to ensure continuity.
• Background and detail: BT highlights progress across sectors (local and central government, emergency services and utilities) with CNI WLR volumes reduced significantly (water sector and government bodies seeing around 50% reduction over the past year). Customers are asked to engage with BT, contact 0800 023 2698 for support, or visit https://business.bt.com/insights/what-is-ip-technology for information.