Verdict up front: if your problem is dropped voice calls on O2, Vodafone, giffgaff, Sky Mobile, Tesco Mobile, Lebara or Lycamobile and your property is 1500 m² or larger, the G2000 Mobile Booster at £565.83 is the correct buy. The G2000 and the G1000 are both Band 8 (900 MHz) voice-only boosters, but the G2000 doubles the coverage to 2000 m², adds 5 dB of gain, upgrades the outdoor antenna from a 10 dBi panel to a 14 dBi Yagi, extends the coax from 20 m to 30 m, splits the indoor signal to two directional panels, raises output from 23 dBm to 25 dBm, and lowers the noise figure from ≤3 dB to ≤2.5 dB. The entire upgrade costs only £59.92.

Separately, the C2000 at £835.00 is not a bigger version of the G2000. It is a different product line. The G2000 amplifies Band 8 at 900 MHz for 2G GSM and 3G UMTS voice calls and SMS. The C2000 amplifies Band 20 at 800 MHz for 4G LTE mobile data. The C2000 costs £269.17 more because it adds 4G data capability, and it will not fix dropped voice calls any more than the G2000 will fix slow data. In a 2000 m² country estate, hotel or office building where both voice calls and data are bad, the correct installation is both units stacked together, which is a well-understood RF design pattern.

This guide compares four products: the G2000 Voice at £565.83, the G1000 Voice at £505.91, the C2000 4G data booster at £835.00, and the Cel-Fi QUATRA 4000 enterprise DAS unit priced £2000–£3500. We look at the G1000 to G2000 upgrade first, then the voice versus data choice, then the enterprise DAS alternative, and we finish with a scenario-by-scenario recommendation.

The G-Series Is Voice Only: What Band 8 at 900 MHz Actually Means

Before comparing products, it is worth being precise about what the G-Series does. The G2000 (MBG2000gb) and the G1000 (MBG1000gb) both amplify only Band 8, which is the 900 MHz frequency band. In the UK, O2 and Vodafone use 900 MHz for 2G GSM voice and for 3G UMTS voice, which is why these two networks continue to carry phone calls even when 4G data is poor.

900 MHz travels further than higher frequencies, penetrates stone and brick better, and is the band that rural estates, hotels and old stone buildings actually receive at a usable level outdoors. That is why tuning a booster to 900 MHz is the right engineering choice for a UK property where calls keep dropping.

It is also why the G-Series does not support EE or Three. EE and Three carry voice on different bands, and both rely heavily on 4G and 5G for calling. If your problem is dropped calls on EE or Three, the G-Series will not help you. If your problem is slow 4G data on any network, the G-Series will not help you either.

The C2000 is tuned to Band 20 at 800 MHz, which is the 4G LTE frequency that O2, Vodafone, EE and Three all use for mobile data across the UK. It improves data speeds indoors, not voice calls. It does not carry 2G GSM or 3G UMTS voice at all.

Head-to-Head Specification Comparison Across All Four Products

Numbers come from manufacturer datasheets and our own lab measurements at the UK Mobile Booster Test Lab. The key row to watch is the frequency band row, because it is the single biggest difference between the G2000, the G1000 and the C2000.

Three rows deserve attention. First, the frequency band row: the G2000 and the G1000 both do voice, the C2000 does data, and the Cel-Fi does both but at enterprise prices. Second, the coverage row: the G2000 and the C2000 are both rated 2000 m², which is why buyers sometimes think they are interchangeable. They are not. Third, the Ofcom row: all four are licence-exempt or licence-free in the UK, but the Cel-Fi requires a professional installer and a server plus multiple radios.

G1000 vs G2000: What the Extra £59.92 Actually Buys

The G1000 at £505.91 and the G2000 at £565.83 sit only £59.92 apart. That is an unusually small gap for a doubling of coverage, and it is the reason most enterprise buyers end up choosing the G2000. Here is exactly what the £59.92 upgrade buys, in order of how much it matters in the field.

Coverage Doubles from 1000 m² to 2000 m²

This is the headline upgrade. The G1000 covers a single seven to eight bedroom house, a village pub or a small two-storey office. The G2000 covers a 15 bedroom estate, a 20 room hotel, a warehouse plus mezzanine, or a two-storey office block with a separate annexe. In real UK buildings with thick stone walls, the G1000 delivers roughly 700 to 900 m² of usable coverage, while the G2000 delivers roughly 1500 to 1800 m².

Gain Increases from 80 dB to 85 dB

5 dB is a large jump in RF terms. It means the amplifier delivers roughly three times the output power for the same incoming signal. In a rural estate 10 to 12 km from the nearest mast, that extra 5 dB is the difference between a booking call that cuts out and a booking call that stays solid across two wings.

Outdoor Antenna Upgrades from 10 dBi Panel to 14 dBi Yagi

The 14 dBi Yagi is a beam antenna with multiple parasitic elements. It collects roughly 2.5 times more signal energy than the 10 dBi panel on the G1000, and it rejects multipath reflections from stone walls and trees. The trade-off is that the Yagi must be pointed within a few degrees of the mast, whereas the panel is more forgiving.

Coax Cable Extends from 20 m to 30 m

That extra 10 metres is what allows the outdoor antenna to run from a ground-floor service cupboard up to a chimney stack, across a courtyard, or along the rear of a three-storey hotel without buying an extension. For a country estate where the booster sits in the basement and the chimney is 24 metres away, the 30 m cable is a requirement rather than a luxury.

Indoor Signal Splits to Two Directional Panels

The G1000 ships with one indoor directional panel. The G2000 ships with a splitter driving two indoor directional panels. One panel covers the main house, the second covers the east wing or the annexe. This is the engineering change that makes multi-wing coverage possible without buying a second amplifier.

Output Power Increases from 23 dBm to 25 dBm

That 2 dB jump is roughly 1.6 times the radiated power indoors. Combined with the 5 dB extra gain and the Yagi antenna, it is what allows the G2000 to hold 3 to 4 bars on multiple floors and across two wings instead of dropping to 1 bar at the far end of the annexe.

Noise Figure Improves from ≤3 dB to ≤2.5 dB

A lower noise figure means the boosted signal is cleaner, not just louder. In a weak-signal rural location, that 0.5 dB improvement is the difference between a call that sounds clear and a call that has background hiss.

G2000 Voice vs C2000 4G: The Most Common Confusion

The G2000 at £565.83 and the C2000 at £835.00 look superficially similar. Both are rated for 2000 m². Both deliver 85 dB of gain. Both use a 14 dBi Yagi outdoor antenna on a 30 m coax. Both are UKCA and CE certified and Ofcom licence-exempt. But they do completely different jobs, and the £269.17 price difference is because the C2000 adds 4G data capability.

The C2000 is not a better G2000. It is a complementary product. If your phones keep dropping calls, the G2000 fixes that and the C2000 does nothing for it. If your 4G data is slow inside the building, the C2000 fixes that and the G2000 does nothing for it.

In a 2000 m² country estate, hotel or office building where both calls and data are poor, the correct installation is both units stacked together. The G2000 pulls in Band 8 at 900 MHz for voice, the C2000 pulls in Band 20 at 800 MHz for data, and the two units sit in the same service cupboard on separate donor antennas. This is a well-understood RF design pattern because the two bands are far enough apart that they do not interfere.

The combined cost is £565.83 plus £835.00, which is £1400.83 for full voice and 4G data coverage across 2000 m². That is still far cheaper than a Cel-Fi QUATRA 4000 at £2000–£3500, and it is the standard recommendation for enterprise properties where both voice and data need improvement.

When the Cel-Fi QUATRA 4000 Actually Makes Sense

The Cel-Fi QUATRA 4000 is a true enterprise distributed antenna system. It costs £2000 to £3500 per installation, requires a professional installer, and is built from a server unit plus up to 24 interior antennas. It covers up to 10,000 m², supports all UK networks, and handles hundreds of simultaneous users across multiple bands.

The Cel-Fi is the right answer when you are covering a 5000 m² office block, a multi-storey hotel with 50 plus rooms, a hospital wing, a shopping centre or a warehouse plus three floors of office space. It is overkill for a 2000 m² estate, a 20 room hotel or a two-storey office block. At £2000 minimum, it costs roughly three and a half times the G2000, and you do not get three and a half times the coverage in a 2000 m² building.

For most readers of this guide, the choice is between the G2000 at £565.83 for voice, the C2000 at £835.00 for 4G data, or both stacked at £1400.83. The Cel-Fi QUATRA 4000 is the next step up only once your building exceeds 3000 m² or you need to support hundreds of concurrent users.

Price, Coverage and Value Comparison

We calculated the cost per square metre of real coverage over five years, including electricity at 34 p per kWh and typical installation accessories. The G2000 and the C2000 are compared on their own job, not on each other's job.

The G2000 wins on cost per square metre of voice coverage at £0.30. The C2000 at £0.44 per m² of 4G data coverage is the cheapest way to improve 4G data indoors across 2000 m². The Cel-Fi at £0.29 per m² only wins once you actually cover 10,000 m²; at smaller scales its fixed cost dominates. Stacking the G2000 and the C2000 at £1400.83 for full voice and data across 2000 m² is £0.70 per m² combined, which is still well below the Cel-Fi at that building size.

Honest Pros and Cons of Each Product

Final Verdict: Which Booster Should You Actually Buy?

The answer depends on whether your pain is voice calls, 4G data, or both, and on the size of your property. Here is the recommendation for each common scenario.

You Only Have Dropped Voice Calls and Your Building Is Under 1100 m²

You Only Have Dropped Voice Calls and Your Property Is 1500 m² or Larger

You Only Have Slow 4G Data and Voice Calls Work Fine

You Need Both Voice Calls and 4G Data Across a 2000 m² Estate or Hotel

Large Country Estate with Multiple Wings, Basement Spa and Courtyard Office

20+ Room Hotel with Annexe, Function Room and Staff Accommodation

Enterprise Office Building of 3000 m² or More, or 50+ Concurrent Users

Budget Is Tight and You Are on the Borderline Between 1000 m² and 1500 m²

The Bottom Line

Frequently Asked Questions