Will my digital phone work in a power cut?
Usually not unless the ONT/router/phone equipment has backup power. Ofcom requires providers to address emergency-call resilience, especially for at-risk customers.
Customer vulnerability; equipment; backup duration; mobile coverage.
Immediate specialist/customer-care escalation.
Show the technical detail
On a managed Wi-Fi plan
Follow GIQ vulnerable-customer and battery-backup policy; never give generic reassurance.
On another provider's router
Contact the voice provider for its resilience solution.
What to be careful of
Safety-critical: advise an alternative means of calling 999 and follow policy.
Where this comes from: Official · see the original source ↗ · Draft—technical review · checked 17 August 2026