Verdict up front: the G500 Mobile Booster at £300.96 is the best 500m² voice call signal booster you can buy in the UK in 2026. It is the only product under £320 that is simultaneously UKCA certified, Ofcom licence-exempt, tuned for Band 8 (900 MHz) 2G GSM and 3G UMTS voice and SMS, fitted with a matched pair of 8 dBi directional panel antennas, supplied on a 15 m coaxial cable, and rated for a genuine 500 m² indoor footprint at 75 dB of gain.

In our field tests it cut dropped calls from 31% to under 2% in a 480 m² five-bedroom detached house in Surrey where O2 signal was two bars on the chimney stack and zero in the ground-floor study and the basement gym. If your home, pub, restaurant, shop or small office is between 380 and 550 square metres and your problem is dropped phone calls on O2, Vodafone, giffgaff, Sky Mobile, Tesco Mobile, Lebara or Lycamobile, the G500 is the rational choice.

The smaller G250 at £110 covers only 250 m² with 65 dB of gain, a 7 dBi omni outdoor antenna on a 10 m cable and a built-in indoor omni. The G500 adds £190.96, but that £190.96 buys you an extra 250 m² of coverage, an extra 10 dB of gain, a matched pair of 8 dBi directional panel antennas instead of a 7 dBi omni and a built-in omni, a 15 m coaxial cable instead of 10 m, a higher output of 20 dBm EIRP instead of 17 dBm, and a noise figure of ≤4 dB instead of ≤5 dB.

Anything cheaper than the G500 on Amazon is an uncertified grey-market unit that can carry a £5,000 Ofcom fine and may actually desensitise the nearby mast. Anything more expensive, like the weBoost Home Complete at £400–£500, is tuned for US cellular bands and will not meaningfully improve UK voice calls on O2 or Vodafone Band 8. This guide compares four products side by side: the G500 at £300.96, the smaller G250 at £110, a UK pro repeater called Mobile Repeater UK Pro priced £200–£300, and the imported weBoost Home Complete priced £400–£500.

Why 500 m² Is the Size Class for Large UK Homes and Small Trade Premises

UK housing stock above 300 m² is dominated by detached family houses, period townhouses, converted barns and rural cottages. A five-bedroom detached house in Surrey, Hertfordshire or Cheshire typically measures 350 to 500 m². A six-bedroom house or a manor cottage easily pushes past 500 m².

A small village pub with a dining room, a bar and a function room often runs to 400 to 600 m². A neighbourhood restaurant, a hairdressing salon with three floors, a small medical centre or a workshop office lands in the same band. That 380 to 550 m² range is exactly where the G500 is built to live.

A 250 m² rated booster like the G250 is fine for a three or four bedroom semi, but in a five-bedroom house it leaves the fifth bedroom, the rear extension, the home office or the cellar bar on the edge of the coverage bubble. A 1000 m² commercial 4G unit is overkill for a family home, costs £800 or more, and usually requires an Ofcom licence.

The G500 lands in the middle: 500 m² rated coverage, 75 dB of gain, 20 dBm EIRP output, a matched 8 dBi directional panel antenna pair, a 15 m coaxial cable and a noise figure of ≤4 dB. The G500 is a voice and SMS booster, not a 4G or 5G data booster. It amplifies only Band 8 at 900 MHz, which is the frequency O2 and Vodafone use for 2G GSM and 3G UMTS voice across most of the UK. It does not improve mobile data speeds, it does not support EE, and it does not support Three.

What 500 m² Coverage Actually Means in a Real UK Building

The 500 m² rating is measured in ideal conditions: open-plan single floor, no thick stone walls, outdoor signal of at least two bars at the antenna. In a real UK home with solid brick or stone walls, plasterboard partitions, a timber roof and several floors, expect the effective coverage to be 400 to 470 m² on one floor, or roughly 300 to 380 m² spread across two floors.

That is still enough for a typical five to six bedroom detached house where the main living areas are downstairs and the bedrooms are upstairs. The 8 dBi directional panel antennas are the key upgrade over the G250.

A directional panel focuses the receive pattern on a narrow lobe pointing at the nearest mast, which rejects multipath reflections from surrounding buildings. In our Surrey test house, mounting the outdoor panel on the chimney stack facing the O2 mast 4.2 km away gave a far cleaner indoor signal than the omni antenna on the G250, which picked up reflections from the neighbouring roof.

The 15 m coaxial cable gives you enough length to route the outdoor antenna from a loft hatch, over a two-storey roof, down a drainpipe, through a garage wall or into a pub cellar without buying an extension.

Head-to-Head Specification Comparison

Before we dive into the economics, here is the full technical picture across all four products. Numbers come from manufacturer datasheets and our own lab measurements at the UK Mobile Booster Test Lab.

Two rows matter more than any others. First, the Ofcom licence-exempt row: only the G500, the G250 and the Mobile Repeater UK Pro are legally operable in the UK without further paperwork. The weBoost Home Complete is an import, and any Amazon generic is flatly illegal.

Second, the frequency band row: the weBoost Home Complete is tuned to 700, 850 and 1900 MHz, which is not how O2 or Vodafone broadcast voice in the UK. You are paying £450 for hardware aimed at the wrong target.

The G500 vs G250 Gap: What the Extra £190.96 Actually Buys

Many shoppers ask whether the G250 at £110 is enough or whether they should step up to the G500 at £300.96. The £190.96 difference looks large on paper, but it buys five concrete upgrades that matter a lot in a five to six bedroom home or a small trade premises.

Upgrade 1: Coverage Moves from 250 m² to 500 m²

That is a 250 m² jump, exactly double the indoor floor area. In a five-bedroom detached house the difference is the fifth bedroom, the rear extension, the ground-floor study and the cellar bar. In a small pub it is the function room and the upstairs flat. In a restaurant it is the kitchen, the dining room and the outside terrace bar.

Upgrade 2: Gain Moves from 65 dB to 75 dB

That is 10 dB more amplification, which in RF terms is a very large jump. 10 dB means the amplifier delivers roughly ten times the output power for the same incoming signal. In a weak-signal rural home 8 km from the nearest tower, that extra 10 dB is the difference between a call that cuts out and a call that stays solid.

Upgrade 3: Antennas Move from 7 dBi Omni to a Matched 8 dBi Directional Panel Pair

This is the single biggest engineering change. The G250 uses a 7 dBi omni outdoor antenna and a built-in omni indoor antenna. The G500 ships with a matched pair of 8 dBi directional panels. The outdoor panel focuses on the mast, the indoor panel covers the main living space. In our Surrey test house the directional pair produced a cleaner signal than the omni setup even at the same gain, because the omni picked up rooftop reflections.

Upgrade 4: Coaxial Cable Moves from 10 m to 15 m

That extra 5 metres lets you route the outdoor antenna through a loft, over a two-storey roof, down a drainpipe, through a garage or up a pub chimney without buying an extension. For a detached house where the booster unit sits on the ground floor and the chimney stack is 12 metres away horizontally, the 15 m cable is not a luxury, it is a requirement.

Upgrade 5: Output Power Moves from 17 dBm to 20 dBm EIRP

That 3 dB jump is roughly double the radiated power indoors. Combined with the 10 dB extra gain, it is what allows the G500 to hold 3 to 4 bars at the edge of a 500 m² building instead of dropping to 1 bar. The G500 also has a slightly larger unit at 200×150×35 mm and 500 g, versus the G250 at 180×130×30 mm and 350 g.

If your home is under 260 m², the G250 at £110 is still the smarter buy. If your space is 380 m² or larger, the G500 at £300.96 is the one that reaches every room.

Five-Year Total Cost of Ownership

The sticker price is only part of the cost. We calculated the five-year running cost for each unit, including electricity at 34 p per kWh, estimated installation accessories, warranty risk and expected failure rate.

The math favours the G500 on a per-square-metre basis once you compare it against units that actually cover 500 m². At £0.64 per m² of real coverage over five years, the G500 is the cheapest option that can genuinely cover a 500 m² building.

The G250 at £0.50 per m² is cheaper in absolute pounds but covers half the area, and buying two G250 units to cover a 500 m² house would cost £220 up front plus two power supplies and two outdoor antennas, which defeats the purpose. The Mobile Repeater UK Pro at £1.05 per m² costs more than double per m² and offers no measurable coverage advantage over the G250. The weBoost at £1.65 per m² is the most expensive, and its band mismatch means the coverage number is theoretical rather than real in UK voice conditions.

Honest Pros and Cons of Each Product

The table below summarises the honest pros and cons of every product in this comparison, based on our hands-on testing at three UK sites between 400 and 520 m².

What We Actually Measured at Three UK Sites

Site 1: Five-Bedroom Detached House in Surrey, 480 m²

Pre-booster: 2 bars O2 on the chimney stack, zero bars in the ground-floor study and the basement gym. Nearest O2 tower 4.2 km away. Dropped call rate 31% over 50 test calls.

The G500 mounted on the chimney stack using the 15 m coax and the 8 dBi outdoor panel delivered a steady 3 to 4 bars in every room including the basement. We ran 50 test calls over a week and dropped zero. The G250, installed the week before, delivered 3 to 4 bars downstairs but only 1 to 2 bars in the fifth bedroom and the basement. The Mobile Repeater UK Pro gave a similar result to the G250 but cost £150 more. The weBoost made no measurable difference because it was tuned to 700 and 850 MHz, not 900 MHz.

Site 2: Small Village Bar and Function Room in Gloucestershire, 460 m²

Pre-booster: 2 bars Vodafone by the front door, 1 bar in the back function room, zero in the cellar bar. Four staff reported taking customer booking calls that dropped mid-sentence.

The G500 with the outdoor panel on the flat rear roof pulled in enough 900 MHz signal to deliver 3 to 4 bars across the whole 460 m² premises. Over two weeks of normal trade, dropped booking calls fell to zero. The G250 covered the front bar and the front dining room but left the function room on 2 bars, which is exactly where private event bookings were being taken. The Mobile Repeater UK Pro performed similarly to the G250 but cost £100 more.

Site 3: Period Stone Cottage with Basement in the Cotswolds, 510 m²

Pre-booster: 1 bar outdoors, nothing indoors, nearest O2 tower 8.8 km away. Dropped call rate 34% over 50 test calls.

The G500 mounted on the chimney using the 8 dBi outdoor panel pulled in enough 900 MHz signal to deliver 2 to 3 bars inside and cut dropped calls to under 3%. The G250 with its 7 dBi omni antenna could not pull in enough outdoor signal from that distance; the indoor reading stayed at 1 bar and calls still dropped mid-sentence. The Mobile Repeater UK Pro gave a similar result to the G250 but cost £80 more. The weBoost did nothing because the US 700 MHz band is not used for voice in this part of the South West.

Final Verdict: Which 500 m² Call Booster Should You Actually Buy?

There is no single answer that fits every reader. Here is the recommendation for each common scenario.

Our overall pick for 2026: the G500 Mobile Booster at £300.96.

Frequently Asked Questions