Question to the Department for Science, Innovation & Technology:

To ask the Secretary of State for Science, Innovation and Technology, what assessment she has made of the potential impact of the retirement of the Public Switched Telephone Network and the transition to VoIP landline services, particularly during power outages on public safety in rural areas with (a) limited and (b) no mobile phone coverage.

The number of major incidents on the PSTN (affecting 500 or more customers) has been increasing. In 2024, there was a 45% increase compared to the previous year. In 2024/25 there were over 2,600 major incidents on the PSTN. VoIP landline services are more resistant to severe weather as the cables used are waterproof, and less prone to damage during a storm or other severe weather events. Over two thirds of landlines have already been migrated to VoIP.

The Government is committed to ensuring that any risks arising from the industry-led migration from the Public Switched Telephone Network (PSTN) to Voice over Internet Protocol (VoIP) are mitigated, including for rural residents who are landline-dependent.

In November 2024, the Government secured additional safeguards from communication providers. These include providing free battery back-up units for landline-dependent customers to ensure emergency access for at least one hour during power outages. Many communication providers offer battery back-up unit lasting 4-7 hours. This will enable people without mobile coverage to continue to access emergency services using their landline during a power cut.