Will an Alarm Watch Work Where Your Loved One Lives? Checking Mobile Signal in Ireland

In short: an alarm watch works wherever there is mobile signal, and nowhere else. Before you buy, check the address on ComReg's free coverage map using the Eircode, then test the signal inside the house, room by room. If your loved one already has a mobile alarm, check it does not rely on 3G, which eir begins switching off from 1 October 2026.

Every alarm watch, and every alarm with a SIM card inside, has the same honest limit. When the button is pressed, the call for help travels over the mobile network. If there is no signal, it cannot get out. That is not a reason to avoid a mobile alarm. It is a reason to spend ten minutes checking the signal where your loved one actually lives and goes, before you choose.

Step 1: check the address on ComReg's coverage map

ComReg, the communications regulator, publishes a free Outdoor Mobile Coverage Map, also available as an app. It is the simplest place to start.

• Enter the Eircode of your loved one's home. You can zoom right in on the house.
• Look at each network. The map shows predicted coverage for eir, Three and Vodafone, and for the smaller networks that run on them.
• Read the strength, not just the colour. Coverage is graded from very good, good and fair down to fringe and no coverage. Fringe is a warning sign for anything that has to work in an emergency.
• Check the places they go too: the shop, the church, a neighbour's house, the usual walk.

One caution: the map is a prediction for outdoors. Indoors, signal is almost always weaker.

Step 2: test inside the house

This is the step most families skip, and the one that matters most. Old Irish houses with thick stone walls, a cottage in a hollow, or a bedroom at the back of the house can all lose a bar or two compared with the front door.

Take a mobile phone on each network you are considering, or borrow one, and go round the house:

1. The bedroom, especially at the bedside, because night is when help is often needed.
2. The bathroom, a common place for a fall.
3. The kitchen and the sitting room, where most of the day is spent.
4. The back garden and the shed, if your loved one potters outside.

Make a short call from each room and note how clear it is. If one room is patchy on every network, that is useful to know before you buy anything.

Step 3: ask which network the alarm uses

A watch or alarm locked to one network is only as good as that network at your loved one's address. A roaming SIM can use whichever network is strongest where the device is, which helps in rural Ireland, where one network can be strong in one townland and weak in the next. Ask the supplier plainly: which network, or networks, does it use?

The 3G switch-off: check older alarms now

Mobile networks in Ireland are retiring 3G. Vodafone switched its 3G network off in 2024, and eir begins switching off 3G on a phased basis from 1 October 2026, which also affects GoMo and Lyca Mobile. ComReg lists monitored care alarms, GPS trackers and smartwatches among the devices that may stop working properly.

If your loved one has an older mobile alarm or tracker, ask the supplier whether it relies on 3G, and what they will do about it. A test call after the switch-off reaches their area is a sensible check.

What happens when there is no signal

Signal comes and goes, even in a well covered area. So it is worth asking what a system does when a device goes quiet.

• Does the alert try again? A good device keeps trying until it gets through.
• Does the family find out? A good app tells you plainly when it last heard from the watch, and lets you know if it has gone quiet for a while, rather than showing an old location as if it were live.
• Is indoor location honest? GPS works outdoors. Indoors, a watch falls back on nearby WiFi and mobile masts, so location inside is approximate. We explain more in our guide to GPS watches for the elderly.

Where Norse fits

We make an alarm watch for families in Ireland: a dedicated 4G watch with its own roaming SIM, an SOS button, automatic fall detection and GPS, with alerts sent straight to the family through a simple app. The app shows when the watch was last heard from, and tells the family if it goes quiet for a while during the day. It is launching soon, and you can see it on the watch page. If there is no landline at home, our guide to alarms that work without a landline covers the other options too.

We would always rather you checked the signal first. An alarm watch depends on mobile signal where your loved one is, and on being worn and charged. It is reassurance, not a guarantee.