How to improve mobile coverage at home (2026 guide)

If calls drop at home, messages lag and you have to step onto the balcony to talk, you are not alone. Poor indoor mobile coverage is very common on the Costa Blanca, and it almost always has a solution. Here is why it happens and which legal options exist.

Why coverage fails inside the home

Mobile signal weakens as it passes through walls and structures. The most common causes are:

• Distance to the mast, typical in villas, inland villages and fincas.
• Building materials: reinforced concrete, stone walls, metal sheeting or heat-treated glass.
• Location: ground floors, basements, storerooms and garages.
• Terrain: hills, mountains and trees blocking line of sight, as on the Montgó or hillside urbanisations.

Free tricks to try first

Before investing, try the simple things:

1. Enable WiFi Calling (VoWiFi) in your phone settings if your operator supports it: you will call over WiFi without relying on the mobile signal.
2. Position the router and use the part of the house with the most signal.
3. Check with each operator which gives you the best coverage at your address.

In many cases, WiFi Calling solves the problem at no cost, especially in rural homes with good fibre.

Legal professional solutions

If you need real mobile coverage throughout the home, you need to go a step further. In Spain this must be done legally: only homologated equipment (CE marking and AGC), installed with operator authorisation, may be used. The options are:

• A homologated signal repeater. An exterior antenna captures the signal, an amplifier boosts it and indoor antennas distribute it. Ideal for villas and homes with some outdoor signal.
• An operator femtocell. A mini device providing indoor coverage over your fibre. 100% legal as it belongs to the operator.
• Optimised WiFi Calling. When there is no outdoor signal but good internet.

Beware "do-it-yourself" boosters

Cheap boosters sold online promise to fix everything. The problem is that installing a repeater without operator authorisation is illegal in Spain, even if the device has CE marking, and it can cause interference, fines and equipment seizure. That is why it is best left to an installer who works with homologated equipment and coordinates the permit with your operator.

Start with a coverage survey

The right way to fix it is to measure. At ElectriPro Alicante we run a coverage survey that measures each operator's real signal in every part of your home. With that data we choose the most effective legal solution and give you a fixed quote. That way you don't buy equipment blindly, and you make sure the improvement is stable and within the law.

Poor coverage at home? Tell us about your case and we'll advise you with no obligation.