Digital landlines: check your power plan
What the switch means for calls during a power cut.
Explainer · Reviewed October 2026
The official guidance
Ofcom explains that digital landlines rely on electricity and may need an alternative power arrangement during a power cut. Its guidance was updated on 26 August 2026.
What to ask your provider
- Which equipment in my home needs to stay powered?
- What arrangements are available if I rely on my landline?
- Will my alarm or other connected equipment work after the change?
Our take
Do not start by buying a battery at random. Ask the provider to explain the complete setup, then test any agreed solution. Keep a usable alternative way to call if your circumstances allow.