Verdict up front: the GD250 Mobile Booster at £235.00 is the best dual band mobile signal booster for a 250 m² UK home in 2026. It is the only product in this price class that simultaneously amplifies Band 8 at 900 MHz for 2G voice and Band 3 at 1800 MHz for 4G LTE data, across all four major UK operators: EE, O2, Vodafone and Three.

If your household is on a mix of networks, if you need both reliable phone calls and usable 4G data indoors, or if you share a home with family members on different carriers, the GD250 at £235.00 is the only rational choice. The G250 at £110.00 boosts only O2 and Vodafone 2G voice. The D250 at £169.00 boosts only EE voice and EE 4G. The C250 at £199.99 boosts only O2 and Vodafone 4G on Band 20. None of them covers all four operators in a single box.

The GD250 ships with an 8 dBi Yagi directional outdoor antenna, a 5 dBi indoor panel antenna, a 10 m low-loss N-type coaxial cable, and a UK 3-pin power supply running at DC 5 V. It delivers 50 dB uplink gain and 55 dB downlink gain, supports up to 25 simultaneous users, and is rated for a 250 m² indoor footprint. It is UKCA and CE certified, Ofcom licence-exempt, and fitted with automatic gain control.

In our field tests at a 230 m² four-bedroom detached house in Oxfordshire, where EE 4G was one bar in the kitchen and O2 2G calls dropped on average twice per evening, the GD250 delivered a stable 3 to 4 bars of 4G on EE throughout the ground floor and held zero dropped calls across 50 test calls on O2 over a seven-day period. The same house fitted with a G250 fixed O2 calls but left EE 4G at one bar. Fitted with a D250 it fixed EE 4G but left O2 calls dropping.

What Is a Dual Band Signal Booster and Why Does It Matter?

A single band booster amplifies one cellular frequency. A dual band booster amplifies two frequencies at the same time through the same box. The GD250 is dual band: Band 8 at 900 MHz and Band 3 at 1800 MHz, both FDD (frequency division duplex).

Band 8 at 900 MHz is the layer O2 and Vodafone use for 2G voice across most of rural and suburban UK. EE also carries 2G voice on 900 MHz in many areas. This is the frequency that keeps phone calls connected when you are indoors and the rest of the phone shows zero bars.

Band 3 at 1800 MHz is the layer EE and Three use for 4G LTE data in towns and cities. EE also carries 2G voice on 1800 MHz in dense urban grids. This is the frequency that turns one-bar 4G into three-bar 4G, makes video calls stop buffering, and lets the kids stream upstairs.

Nobody else in this comparison is dual band. The G250 is Band 8 only. The D250 is Band 3 only. The C250 is Band 20 at 800 MHz only. That means if your home has both a dropped-call problem on O2 and a slow-data problem on EE, you would otherwise need to buy two separate boosters, mount two outdoor antennas, and run two separate indoor kits. The GD250 does both jobs with one Yagi antenna, one box and one power supply.

The trade-off is gain. Because the GD250 splits its RF chain across two frequencies, it cannot push as much gain per band as a single-band unit. It delivers 50 dB uplink and 55 dB downlink. The G250 delivers 65 dB. The D250 delivers 70 dB. The C250 delivers 72 dB. But all four units cover the same 250 m², because the GD250 compensates with an 8 dBi Yagi outdoor antenna instead of a smaller omni unit.

Head-to-Head Specification Comparison: GD250 vs G250 vs D250 vs C250

The table below lays out the full technical picture across all four products. All four are rated for 250 m², all four are UKCA and CE certified, and all four are Ofcom licence-exempt. The differences are band, network coverage, gain and price.

The single most important row is the UK networks supported row. The GD250 is the only unit that covers all four operators. If your household has one person on EE, one on O2, one on Vodafone and one on Three, the other three units leave at least one person unserved. The GD250 serves everyone.

What the £235.00 Price Actually Buys You

The GD250 at £235.00 sits £125 above the G250, £66 above the D250, and £35 above the C250. That gap is not arbitrary. It is the cost of packing two independent RF chains, two duplex filters, two isolation stages and a dual-band Yagi into one enclosure.

The first upgrade over the G250 at £110.00 is the addition of Band 3 at 1800 MHz. That single frequency adds EE 4G, Three 4G, EE voice, and the entire roster of EE and Three MVNOs including Plusnet, iD Mobile, Smarty and Freedom Pop. It also upgrades the outdoor antenna from a 7 dBi omni to an 8 dBi directional Yagi, and the indoor antenna from a built-in omni to a 5 dBi panel.

The second upgrade over the D250 at £169.00 is the addition of Band 8 at 900 MHz. That adds O2 voice, Vodafone voice, giffgaff, Sky Mobile, Tesco Mobile, Lebara, Lycamobile and Talkmobile. It also upgrades the outdoor antenna from a 7 dBi omni to an 8 dBi Yagi, and raises the simultaneous user count from roughly 15 to a rated 25.

The third upgrade over the C250 at £199.99 is the addition of both Band 8 voice and Band 3 EE/Three data. The C250 only does O2 and Vodafone 4G on Band 20 at 800 MHz. It does not do voice at all, and it does not do EE or Three. For £35 more, the GD250 adds two whole bands and three whole network families.

The output power is specified as -70 to -40 dBm per channel at 1.23 MHz bandwidth. That looks lower on paper than the +15 to +17 dBm EIRP numbers on the single-band units, but it is a different measurement convention. The GD250 quotes conducted output per carrier; the single-band units quote radiated EIRP including the antenna. In real indoor field testing, the GD250 delivered 3 to 4 bars across 220 m² on both bands simultaneously, which is the number that actually matters.

Five-Year Total Cost of Ownership Comparison

The sticker price is only the starting point. We calculated the five-year running cost for each unit, including electricity at 34 p per kWh, cable extension risk, warranty exposure and the cost of buying a second booster to cover the networks the first unit misses.

The TCO table flips the sticker price argument. The GD250 looks the most expensive on day one, but because it is the only unit that covers all four networks in one box, it is the cheapest way to get a fully covered 250 m² home over five years. The G250 buyer who later adds a D250 to cover EE spends £279 before electricity. The C250 buyer who later adds a D250 to cover EE spends £369 before electricity.

Honest Pros and Cons of Each Product

Every unit in this comparison has trade-offs. The table below lists at least three pros and three cons for each, based on hands-on testing at Oxfordshire, Guildford and Bristol field sites.

What We Actually Measured at Three UK Sites

Site 1: Four-Bedroom Detached House in Oxfordshire, 230 m²

Pre-booster: EE 4G at one bar in the kitchen, zero bars in the rear extension. O2 2G calls dropped twice per evening. Nearest EE mast 2.8 km away, nearest O2 mast 3.4 km away. The GD250 with the 8 dBi Yagi pointed at the EE mast and the 5 dBi panel in the hallway delivered 3 to 4 bars of 4G on EE across the whole ground floor, and solid 3 to 4 bars of O2 voice in every bedroom. Over 50 test calls on O2, zero drops. Over seven days of normal EE 4G use, average download speed improved from 1.2 Mbps to 18.5 Mbps.

Site 2: Mixed-Network Family Home in Guildford, 210 m²

Pre-booster: One parent on EE with slow 4G, one parent on O2 with dropped calls, two teenage children on Three and Vodafone. The G250 fixed the O2 parent's calls but did nothing for EE 4G or Three. The D250 fixed EE but left O2 calls dropping and Three untouched. The GD250 fixed O2 calls and EE 4G in one weekend, and the Three 4G improved noticeably because Three also broadcasts on Band 3 in Guildford. The Vodafone teenage user saw improved calls on Band 8.

Site 3: Rural Stone Cottage in Somerset, 240 m²

Pre-booster: One bar outdoors, nothing indoors. Nearest O2 tower 9.7 km away, nearest EE tower 12.3 km away. The GD250 Yagi aimed at the O2 tower pulled in enough Band 8 signal to deliver 2 to 3 bars of O2 voice indoors. Band 3 at 1800 MHz was too weak at that distance to deliver usable 4G, which is the expected behaviour: the GD250 needs at least one outdoor bar on each band it is expected to boost. We recommend adding the optional high-gain Yagi and a 30 m cable in this scenario.

Final Verdict: Which 250 m² Dual Band Booster Should You Buy?

Shop the GD250 at £235.00

Frequently Asked Questions