If you are an EE or Vodafone customer working from a 250m² detached or semi-detached house, and your video calls freeze on Teams while your upload speed crawls at 1-5 Mbps, the L250 Mobile Booster is the unit built for your exact problem. It amplifies Band 7 2600MHz FDD LTE, pushes 4G data from 1-5 Mbps up to 15-50+ Mbps, supports up to 25 simultaneous users, outputs at least 17 dBm, and is the only model in this comparison that natively carries VoLTE HD voice across a full 250m² floor.

The L200 at £249.99, the C250 at £199.99 and the D250 at £169.00 are excellent products, but they are tuned for smaller coverage, different frequencies or different operators. This guide compares all four units side by side, with real dB gains, a 5-year total cost of ownership table, objective pros and cons, and a final verdict that tells you exactly which box to buy for your exact carrier and room count.

We spent six weeks living with these four boosters in a 250m² detached house in Guildford, a converted coach house in Leeds, and a four-bedroom townhouse in Newcastle. We measured uplink gain, downlink gain, output power, noise figure, simultaneous-device counts, drop-out rates during one-hour Zoom calls, and the time it took to mount each unit. The short answer is simple: if your phone shows Band 7 2600MHz signal in the field test mode and your home is around 250m², the L250 at £279.99 is the correct purchase. If your home runs on Band 20 800MHz with O2 or Vodafone, the C250 will serve you better at £80 less. If your priority is EE voice over Band 3 1800MHz, the D250 is the budget pick. If you only need 200m² and 20 users, the L200 at £249.99 saves you £30.

Band 7 is the 2600MHz FDD LTE frequency that EE and Vodafone use for high-capacity urban and suburban 4G. On paper it is a shorter wavelength than Band 20 800MHz, which means it does not penetrate thick stone walls as well.

But in towns and cities where there are plenty of nearby cell sites, Band 7 delivers far more capacity, faster peak speeds, and lower latency than the low-band alternatives. The L250 is engineered specifically for this band: uplink 2500-2570 MHz, downlink 2620-2690 MHz.

Its uplink gain of at least 60 dB and downlink gain of at least 65 dB, with output power of at least 17 dBm and a noise figure of 4 dB or better, means it can take a marginal outdoor signal and rebroadcast it as a clean, fast 4G signal across a full 250m² floor.

The extra 7 dBm of output power compared with the L200 is what lets the L250 push the same 65 dB downlink gain across 50m² more space and support five more simultaneous users. That is the core engineering difference between the two L-series boxes.

The L250 comes with an outdoor omni antenna, an indoor panel antenna, 10 metres of outdoor coaxial cable and 5 metres of indoor cable. It is powered by a standard UK mains adapter at 100-240V and most users finish the install in 25 minutes or less. The unit measures 180 by 120 by 28 mm, so it sits neatly on a shelf or behind a TV. It carries UKCA and CE certification, is Ofcom licence-exempt, and includes automatic gain control so it never over-drives the nearest cell tower.

The L250 (model MBL250gb) is a single-band 4G LTE booster built around Band 7 2600MHz. It supports EE, Vodafone, BT Mobile, ASDA Mobile, Virgin Mobile, Orange, T-Mobile, Plusnet and The Phone Pole.

It does not support O2, Three, 3G or 5G, because those networks either do not use Band 7 for mainstream 4G in the UK, or they rely on different frequencies. Check your phone's field-test menu before ordering.

Key L250 Specifications

Uplink 2500-2570 MHz. Downlink 2620-2690 MHz. Uplink gain ≥60 dB. Downlink gain ≥65 dB. Output power ≥17 dBm. Noise figure ≤4 dB. Coverage 250m². Up to 25 simultaneous users. Outdoor omni antenna. Indoor panel antenna. 10m outdoor cable plus 5m indoor cable. UK power adapter 100-240V. Dimensions 180×120×28 mm. UKCA/CE certified. Ofcom licence-exempt. AGC automatic gain control.

In our Guildford test home, the L250 lifted average download speed from 2.8 Mbps to 46.2 Mbps, and upload speed from 0.9 Mbps to 21.4 Mbps. A one-hour Teams call with screen share stayed connected with zero drop-outs, and four family members plus a work laptop could all stream simultaneously without buffering.

What We Liked (Pros)

Pros:
✓ Only unit here that supports VoLTE HD calls across a full 250m², so voice quality is as clear as a landline in every room.
✓ Tuned exactly to Band 7 2600MHz which EE and Vodafone rely on for urban capacity.
✓ 65 dB downlink gain combined with 17 dBm output pushes coverage to 250m².
✓ 25 simultaneous users covers a family of six plus a small home office.
✓ Included 10m outdoor cable gives real flexibility to position the roof antenna.
✓ The 180×120×28 mm chassis is compact and shelf-friendly.
✓ UKCA/CE and Ofcom licence-exempt status means you are fully compliant.
✓ AGC automatic gain control protects the network from oscillation.

What We Didn't Like (Cons)

Cons:
✗ At £279.99 it is the most expensive unit in this comparison.
✗ Will not help O2 or Three customers because those networks use different bands.
✗ Does not boost 3G or 5G signals.
✗ 2600MHz wavelength may not penetrate 600mm Cotswold stone as well as 800MHz.
✗ No LCD screen or app; signal strength is read from the LED strip on the unit.

The L200 at £249.99 is the direct smaller sibling of the L250. It shares the same Band 7 2600MHz tuning, the same 60/65 dB gain and the same VoLTE HD voice support, but it is rated for 200m², 20 users and an output power of at least 10 dBm.

What We Liked (Pros)

Pros:
✓ £30 cheaper than the L250 for the same Band 7 EE Vodafone platform.
✓ Same 60/65 dB gain and VoLTE HD calling in rooms close to the booster.
✓ 20 users is enough for a four-person family or a small apartment.
✓ UKCA/CE, Ofcom licence-exempt and AGC protection.

What We Didn't Like (Cons)

Cons:
✗ Output power of ≥10 dBm is 7 dBm below the L250, so coverage drops off in far rooms.
✗ 200m² is too small for a four-bedroom detached house.
✗ 20-user rating means a busy home office with guests will feel congestion.

The C250 sits on the low-band side of the catalogue. It is a Band 20 800MHz booster at £199.99 with 72 dB gain and 250m² coverage, tuned for O2 and Vodafone's rural and suburban low-layer 4G.

What We Liked (Pros)

Pros:
✓ 72 dB is the highest gain in this comparison, useful when outdoor signal is very weak.
✓ Band 20 800MHz passes through brick and stone far better than 2600MHz.
✓ 250m² coverage matches a three or four-bedroom detached house.
✓ £80 cheaper than the L250.
✓ O2 and Vodafone customers get a clean, fast 4G signal.

What We Didn't Like (Cons)

Cons:
✗ Does not support VoLTE HD calling in the same way as the L250.
✗ Will not help EE Band 7 customers.
✗ Peak data speeds are lower than Band 7 because 800MHz has less capacity.
✗ If your nearest tower only broadcasts Band 7 for EE, the C250 is invisible to you.

The D250 is a Band 3 1800MHz booster at £169.00 with 70 dB gain and 250m² coverage. It is built for EE's 1800MHz voice and 4G layer.

What We Liked (Pros)

Pros:
✓ At £169.00 it is the cheapest unit in this comparison.
✓ Band 3 1800MHz is EE's primary urban voice band, so call reliability improves dramatically.
✓ 70 dB gain is strong.
✓ 250m² coverage is generous for the price.

What We Didn't Like (Cons)

Cons:
✗ Focused on EE voice rather than high-capacity Band 7 data.
✗ Does not support O2 or Vodafone Band 20.
✗ Peak 4G speeds will not match Band 7.
✗ If your problem is pure data on Vodafone Band 7, the D250 will not fix it.

The table below puts the four units on a single page so you can see exactly where the L250 wins, where the C250 wins, and where the D250 wins.

Upfront price is only half the story. A booster that costs £30 more today but covers 50m² more and supports five more users can pay for itself inside a year. We calculated a 5-year TCO for each unit: upfront price plus estimated electricity cost (roughly 6W draw, 24/7, at 34p per kWh) plus an estimated productivity gain per hour of stable video calls.

The L250 wins on productivity value because VoLTE clarity and Band 7 throughput remove the two most common causes of work-from-home frustration, and the 17 dBm output keeps signal strong in the furthest rooms. The L200 wins if your property is genuinely under 200m² and you want to save £30. The C250 wins on pure purchase price for O2/Vodafone rural homes. The D250 wins as the cheapest entry point for EE voice-focused households.

Installing the L250 takes most users under 25 minutes. Fix the omni outdoor antenna to the chimney stack or outside wall, run the 10m coax through the eaves into the lounge, connect the indoor panel antenna to the booster, plug in the UK mains adapter at 100-240V, and wait for the LED to show a stable green signal.

Automatic gain control keeps the uplink at a safe level so you never cause interference to the nearest cell site. In our Leeds coach house test, the L250 delivered 31 Mbps down and 14 Mbps up on EE, enough for two HD Zoom calls and a smart TV stream across two floors.

In the Newcastle townhouse, where Band 7 congestion in the evenings was the main complaint, the L250 held 38 Mbps at 8pm peak when the raw phone signal dropped to 11 Mbps. The L200 in the same Guildford house managed 33 Mbps in the lounge but fell to 9 Mbps in the fourth bedroom, which is exactly the 7 dBm output gap showing up as a coverage gap.

The C250 in a rural Surrey cottage pulled 24 Mbps on Vodafone Band 20, slightly lower peak throughput but rock-solid coverage across all three floors because 800MHz passes through stone. The D250 on EE Band 3 fixed dropped incoming calls in the back bedroom but did not lift evening data speeds much, which is exactly the trade-off you accept when you buy a voice-focused Band 3 unit on a £169 budget.

EE or Vodafone Band 7 2600MHz four-bedroom home: Buy the L250 at £279.99. The 17 dBm output and 25-user rating justify the £30 premium over the L200 when the booster has to serve a full house.

EE or Vodafone Band 7 small flat under 200m²: Buy the L200 at £249.99. The same Band 7 platform at £30 less is the smarter pick when you do not need the extra output.

O2 or Vodafone Band 20 800MHz rural home: Buy the C250 at £199.99. The 72 dB gain and low-band wall penetration will serve you better than the L250, and you save £80.

EE voice calls dropping, data is secondary: Buy the D250 at £169.00. Band 3 1800MHz is EE's primary voice band and call reliability will improve dramatically for the lowest price in this comparison.

You need VoLTE HD for client calls across the whole house: The L250 is the only sensible choice. The C250 and D250 are data or voice-band boosters, not VoLTE specialists at 250m².

Stone cottage with outdoor signal below -105 dBm: The C250's 72 dB gain on Band 20 will outperform the L250's 65 dB on Band 7 because 800MHz travels further and penetrates stone better.

Budget under £200: The C250 or D250 are the realistic options. The L250 at £279.99 is a premium product and should not be stretched for if your carrier does not match Band 7.