A home phone may look unchanged after the move to digital calling, but the connection can now depend on powered broadband equipment. Check the actual arrangement in your home before treating the landline as an automatic backup for a mobile.
Identify what your phone uses
Ask your provider whether calls use a broadband router, adaptor or other powered equipment. Note the components and keep their instructions together. A cordless handset can also have its own power dependency. Do not assume that a working wall socket or familiar telephone number means the call path will operate when mains electricity fails.
- Ask how emergency calls work in your particular setup.
Explain your reliance to the provider
Tell the provider if you do not have a working mobile or reliable mobile signal and depend on the landline. Ofcom describes support and backup arrangements for customers in this situation. Ask which solution fits your needs, what it powers and how it should be checked, rather than buying an unverified battery online.
- Record the provider's advice and support contact.
Plan beyond the initial backup period
A battery is finite and may not cover every device or network failure. Agree another way to ask for assistance and a trusted check-in if needed. If a care alarm or other connected device uses the line, contact its supplier as well; phone backup alone does not establish that the alarm will work.
- Review the arrangement when equipment or services change.
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