UK Telecoms Transition from Copper to Digital Networks

The UK is transitioning from its copper-based Public Switched Telephone Network (PSTN) to fully digital, IP-based systems, with the retirement of PSTN scheduled for January 2027. BT has migrated approximately 80% of its voice customers to All-IP services as of January 2026, but thousands of organizations still rely on PSTN-based services. BT is proactively upgrading remaining organizations and ensuring minimal disruption during the transition. Critical National Infrastructure (CNI) services are particularly affected, with significant reductions in PSTN usage reported. The government has collaborated with industry to implement voluntary commitments and safeguards to protect consumers and prevent disruption during this modernization. The transition is crucial for maintaining connectivity and functionality for essential services. BT urges organizations to complete their migration to avoid last-minute disruptions and ensure continuity of service.

Key Points: • The UK will retire its PSTN by January 2027, transitioning to digital networks. • BT has migrated 80% of voice customers to All-IP services as of January 2026. • Voluntary charters are in place to protect consumers and critical infrastructure during the transition.