Moving a landline to a digital service changes the connection a care alarm may rely on. A successful voice call after migration does not establish that an older alarm can reliably send its signal to an alarm receiving centre, or that the complete system will work during a power cut.

For housing and care providers, the task is to identify the whole alarm pathway: the equipment in the home or building, its power and network connections, the receiving service and the people responsible for testing and support.

A network deadline is not an individual migration date

BT’s current public information describes January 2027 as the switch-off timetable for the old analogue network. Providers migrate customers before that point, and the actual arrangements depend on the communications provider and service.

This is a change in how calls are carried, not a rule that every affected home must have an identical fibre installation. An alarm’s continued operation depends on its particular equipment and connection, not simply on whether the household has received a new phone or router.

The Telecare National Action Plan explains that analogue alarms can become less reliable on digital lines. Migration and equipment replacement therefore need coordination; reconnecting a plug is not evidence of compatibility.

A building-wide alarm adds shared dependencies

England guidance published on 8 October 2026 distinguishes personal alarms from grouped living scheme systems, sometimes called warden-call alarms.

In a grouped system, a master unit may receive signals from several flats and communal areas before connecting to the alarm receiving centre. The guidance gives an example of one master serving up to 40 flats. A change to that shared connection can therefore affect many residents, rather than one pendant alone.

These installations may also connect to door entry, lifts or fire systems. Replacing communal telecare with individual alarms does not automatically replace those other functions. The guidance tells housing providers to identify these dependencies and assess the effect of changes on the premises’ fire strategy.

Its housing context is England. The UK network transition does not make every housing duty or local service arrangement identical across the four nations.

Who needs to coordinate what?

The England guidance describes complementary responsibilities rather than one universal handover to the phone company:

  • Housing or telecare providers identify installed equipment, linked building systems and the lines carrying alarm traffic, then coordinate upgrades and resident communication.
  • Communications providers need to know which connections carry telecare so they can arrange the relevant supported migration process.
  • Equipment providers and alarm receiving centres contribute compatibility information and testing of the complete combination, including the connection to the receiving service.

The guidance identifies fully digital communal systems and individual digital alarms as possible replacement approaches. It also discusses interim approaches, which have limits. An adapter or compatibility listing is not a certificate for every installation; the document explicitly calls for verification of the actual equipment, connectivity and receiving centre, followed by monitoring.

The national action plan makes a distinction that can be missed in discussions of battery backup. Communications-provider arrangements for access to 999 during a power cut do not amount to a requirement for uninterrupted telecare calls. An alarm receiving centre is not the same destination as 999.

An alarm’s own battery also cannot power an unprotected router. Conversely, keeping a router running does not establish that the alarm, receiving centre and connecting network remain available. The plan describes several dependencies and notes that mobile connectivity brings its own network-resilience limits.

BT says additional support, including backup power where needed, is available for customers with additional needs. That supplier statement does not establish the backup configuration or runtime in a particular building.

The useful evidence is an end-to-end check

The housing guidance calls for an inventory, sufficient time for installation and testing, regular call testing with the receiving centre and continued attention to failures. It also emphasizes involving residents and making the responsible communications provider aware of telecare use.

For professionals overseeing a transition, those documented steps provide a more useful basis for discussion than a general assurance that the phone still rings. The unresolved question is whether the complete alarm service, with its actual power and connectivity arrangements, has been checked for the people who depend on it.