No mobile signal at home? What actually fixes it

The short version: if you’ve got decent internet at home, turn on Wi-Fi calling on your phone. It’s free, takes a minute, and solves coverage issues in most homes. If that’s not an option, or you need signal for people who aren’t on your Wi-Fi, an approved booster is the next choice.

Note: The cheap boosters sold on overseas websites (such as www.cellphoneboosters.co.nz) aren’t legal to use here.

Why it’s got worse

It’s not just you. 3G is gone, with all networks being switched off for good earlier this year. In most rural areas, phones now run exclusively on 4G, and 4G doesn’t always reach the same spots that 3G did, especially inside houses tucked behind a hill or a shelter belt. A Federated Farmers survey this month found that a third of farmers have a spot on the farm that worked on 3G but no longer does. So if you used to get calls through in the kitchen but can’t anymore, that’s probably why.

We don’t operate the cell towers, so we can’t fix the coverage itself. What we can do is help get calls working reliably inside your home.

One quick check first: text 3G to 550. It tells you whether your phone is set up for 4G calling, including 111. Don’t ring 111 to test it.

Fix 1: Wi-Fi calling (free, try this first)

Your phone sends calls and texts over your home internet instead of the mobile network. Same number, same phone, no install needed. When you leave Wi-Fi range, it switches back to the mobile network automatically (where coverage is available).

iPhone: Settings, then Phone, then Wi-Fi Calling. On some iOS versions, it’s under Mobile Data instead.

Android: Open the Phone app, tap the three dots, then Settings, and look for Wi-Fi calling. On some Samsung mobiles, it’s under Settings, then Connections.

If your phone asks for an emergency address, enter your real one.

A few things to know:

• Most Spark, One NZ and 2degrees plans include it at no extra cost. If you’re on prepaid or with a smaller brand, double-check with them.
• It uses hardly any data. Spark puts it at 1 to 5MB’s per minute of talking.
• It only works where your Wi-Fi reaches. No Wi-Fi in the shed, no calls in the shed.
• It drops out in a power cut unless your modem and router are on a UPS.
• Some VPNs (including work ones) will block it.
• Spark says 111 calls go through over Wi-Fi calling when there’s no mobile signal. Check with your own provider before relying on this.
• Emergency Mobile Alerts are only sent over the mobile network, so you may miss them with no coverage. Follow your local civil defence page as a backup.

It works over WombatWireless X, WombatWireless 4G+, and WombatOptic, and over any other decent connection, including Starlink.

On 4G+? The modem, with an antenna mounted on the roof, can often reach a tower too far away for your phone to see from inside the home. Wi-Fi calling can then piggyback on that.

Fix 2: an approved booster

A cellular booster system uses an antenna on your roof or gable to capture a weak signal and repeat it inside. Every phone on that network gets proper bars, including visitors and workers, with no settings to change. Your phone thinks it’s connected directly to the cell tower.

• It needs some signal outside to work with. It can’t make signal out of nothing, so we test on site before recommending one.
• The regulator and carrier must pre-approve boosters. In New Zealand, only Nextivity Cel-Fi boosters have received regulator (RSM) approval, and we’re the installer for Wellington and the lower North Island. The cheap ones from overseas websites aren’t legal here and can cause network problems for your neighbours. Carriers often block them quickly, leaving you with an expensive paperweight. WombatNET manages the carrier pre-approval process for new installations.
• It only covers one network at a time. If users in your household are split across networks, you will need to install a separate booster for each carrier; otherwise, you may want to look at Wi-Fi calling as an alternative.
• It’s a fully installed solution, so it costs real money, whereas Wi-Fi calling costs nothing. We’ll give you a price once we’ve scoped your place.
• Old booster stopped working after 3G went? It may have been built for 3G. Send us the model, and we’ll tell you whether we can sort it.

A booster earns its keep when you don’t have reliable internet yet, when staff or visitors need signal without logging into your Wi-Fi, when non-mobile phone hardware needs mobile signal, or when Wi-Fi calling isn’t cutting it for whatever reason.

Don’t bother with

Satellite texting as your main option at home. It’s a handy backup out on the farm, but it isn’t built to replace coverage at the house, and it does not work indoors.

Running the house off your phone’s hotspot. It drains and heats the phone, chews through data, and only works where the phone already has signal.

Which one do I need?

Good internet at home: Wi-Fi calling.

No good internet yet: sort that first, then Wi-Fi calling does the rest. We’ll tell you whether fixed wireless, 4G+ or fibre suits your address, or whether Starlink is the better bet.

Signal outside but not inside, or people who need to call without pre-connecting to your Wi-Fi: a booster.

Dead spots out in the paddocks: neither fixes that. Report it to your mobile provider. One NZ has a handy tool called One Pin to help you do this.

Want a hand?

Give us a ring on 0800 424 281 or email [email protected]. Send your address and which network your phones are on. We’ll tell you what will work, and if we can’t get you the answer, we’ll put you in touch with someone who can.