If you’re with eir and your phone drops to one bar the moment you walk in the door, you’re not alone. Stone walls, foil-backed insulation and hilly ground cause poor indoor signal all over Ireland, on every network. Many people search for an “eir booster box”. Here’s what actually helps, starting with the free options.

MySignalBoosters is an independent retailer and isn’t affiliated with eir.

Start with the free fixes

1. Turn on WiFi calling. eir supports WiFi calling on compatible phones and plans. With broadband at home, calls and texts go over WiFi using your normal number. For many homes that’s the whole fix. Check your phone’s settings (Settings > Mobile/Cellular > WiFi Calling on iPhone; Settings > Connections on most Android phones) and eir’s support pages for plan details.

2. Contact eir about the problem. Report the coverage issue to eir with your Eircode. Ask whether there’s a known fault or any indoor coverage option for your account. Coverage reports help networks plan upgrades.

3. Test the other networks. Vodafone and Three run their own masts, so coverage can differ a lot at the same address. A prepay SIM for a week will tell you.

When a booster makes sense

A booster helps when eir signal is usable outside (on the roof, in the garden, at a gable window) but drops off indoors. It picks up that outdoor signal with an external antenna, amplifies it, and rebroadcasts it inside through an indoor antenna. It can’t create signal where there’s none outside.

Step 1: find out which band eir uses at your home

A booster only works on the frequencies it’s built for. In many areas, Irish networks use 800 MHz (long-range 4G) and 1800 MHz (4G capacity), with 700 MHz used for 5G. To check:

1. Go to where the outdoor antenna would go.
2. On Android, use a free app such as Network Cell Info and note the band: B20 = 800 MHz, B3 = 1800 MHz, n28 = 5G on 700 MHz.
3. On iPhone, Field Test mode shows similar data.

Our guide on testing your mobile signal strength walks through this step by step.

Step 2: pick a kit that matches the band

These kits aren’t eir-specific. A booster amplifies the band, so the same kit also works for Vodafone or Three where they use that band at your location.

Step 3: size it to the rooms you use

The coverage figure assumes good outdoor signal. With weak signal outside, expect less. A typical Irish semi-d or bungalow needs a 300 m² kit; a large detached house, or one with weak signal outside, a 500 m² kit. Farms with sheds and yards are covered in our farm guide.

Step 4: install it properly

• Mount the outdoor antenna as high as possible. If it’s directional, point it towards the mast.
• Put the indoor antenna centrally in the main living space.
• Keep the two well apart, ideally with a floor between them, to prevent feedback.
• Keep cable runs short.

The rules in Ireland

ComReg allows certain mobile phone repeaters to be used without a licence, provided they meet the conditions in its regulations, including the frequency bands they cover and their technical limits. 3.5 GHz (3500 MHz) is not a permitted band for these repeaters, so we don’t recommend 3.5 GHz kits for Ireland. More detail is in our guide to the legal requirements in Ireland. Check a kit’s specification before you buy, and install it as the manual says.

FAQ

Does eir sell a booster box?
Ask eir directly what indoor coverage options it offers for your account. We’re an independent retailer and can’t speak for eir.

Will an eir signal booster work with Vodafone or Three too?
Yes, if they use the same band at your location. Boosters amplify frequencies, not a specific network.

Is WiFi calling better than a booster?
For calls at home with good broadband, often yes, and it’s free. A booster also improves mobile data and works for every phone in the house.

How long does delivery take?
Delivery is free and takes 5–7 working days.

How do I ask a question?
Email support@mysignalboosters.com or use the chat on the site. See also the FAQs.