4G LTE - 250m2 (EE/O2/Vodafone/Three) Mobile Signal Booster
✓ Compatible with multiple users and devices
✓ Complete kit: all parts included
✓ Simpler Install and Maintenance
Enhance your mobile experience with our selection of signal boosters for EE, O2, Vodafone, and Three networks, designed to improve indoor coverage across the UK.
Frequently Bought Together
4G LTE Mobile Signal Booster 250m² UK — Boost4U C250 (High Power / All Networks)
The Boost4U C250 is a high-power 4G LTE (Band 20 / 800 MHz) mobile signal booster designed for large homes and small offices up to 250 m², amplifying 4G data and VoLTE calls for all four major UK networks — EE, O2, Vodafone and Three — plus their MVNOs, priced at £199.99 with free UK shipping and a 365-day money-back guarantee.
Engineered for the UK's 800 MHz Band 20 4G LTE spectrum — the low-frequency layer that provides the widest rural coverage and best building penetration — the C250 delivers up to 72 dB of gain, transforming weak 4G signals into fast, reliable mobile internet and crystal-clear VoLTE calls throughout 250 m². The complete kit includes the high-power booster unit, an outdoor omni antenna, an indoor panel antenna, 10 m low-loss cable, UK power adapter and mounting hardware, installing in under 25 minutes without an engineer.
Enhanced 4G/LTE Signal
Experience a significant boost in your 4G/LTE signal with our Mobile Signal Booster. Designed to enhance connectivity for EE, O2, Vodafone, and Three networks, it ensures you stay connected even in areas with weak signals.
Wide Coverage Area
Cover up to 250 square meters with reliable mobile signal. Perfect for homes, cafes, restaurants, and offices, this booster guarantees a strong connection throughout your space.
User-Friendly Installation
Our Mobile Signal Booster comes with a complete kit, making installation a breeze. With all necessary components included, you can set it up quickly and easily without professional help.
Supports Multiple Devices
Connect up to 25 devices simultaneously without compromising on signal strength. Whether it's for family, friends, or colleagues, everyone can enjoy seamless connectivity.
VoLTE Compatibility
Make crystal-clear voice calls using 4G Calling (VoLTE) technology. This booster not only enhances data speeds but also improves call quality, ensuring you never miss an important conversation.
Durable and Reliable
Built to last, our Mobile Signal Booster is designed for durability and consistent performance. Enjoy uninterrupted connectivity, rain or shine, with a device that stands the test of time.
3 Steps to Full Bars
1. Place the Outdoor Antenna
Mount the antenna where you get the best signal.
2. Connect the Booster Inside
Plug in the booster and connect to the antenna.
3. Enjoy Full Bars Everywhere
Clear calls, fast data, and no more dead zones.
4G LTE Mobile Signal Booster EE Signal Booster O2 Signal Booster Vodafone Signal Booster Three Signal Booster Indoor Coverage UK Mobile Booster
It boost 4G/LTE signal on 800MHz frequency, the frequency used in UK used by mobile networks to deliver their 4G mobile services. It can boost all networks on Three, EE, O2, Vodafone, BT, Asda, Virgin, giffgaff, Talkmobile, Lyca Mobile, Tesco, iD Mobile, Freedom Pop, Orange, Plusnet, Sky Mobile, Smarty Mobile, T-Mobile and The People's Operator for improving 4G/LTE signal. If your phones support 4G Calling (also called Voice over LTE or VoLTE) and your area 4G Calling is available, with the booster you can make clearer voice calls using 4G network. It is the best suitable for medium size, boost indoor signal areas up to 250 m2, perfect for home, cafes, restaurants, pubs, clubs and more.
Note: This booster improve EE 4G LTE signal only on Band 20 - 800MHz frequency, EE 4G LTE Band 3 - 1800MHz frequency boosters, can purchase our 1800MHz boosters.
Reliable 4G/LTE Data
Faster Uploads & Downloads
Reception Up to 250 sq.m.
Upgrade External Cables
If our standard package 10 meter external cable length is not enough to cover your area you have an upgrade option.
Upgrade External Aerial
Higher Gain Yagi Antenna - For better performance it's a must if indoor your phone with 1/2 signal bars. Or get this upgrade if outdoor best signal strength in the following range:2G (GSM) -76 to -90 dBm
3G (UMTS) -80 to -94 dBm
4G (LTE) -97 to -105 dBm
How to shown dBm reading on phone? Check Quick Start Guide
Upgrade Protector
Lightning Surge Protector - Designed to Protect your equipment from high amperage surges due to lightning strikes on aerials or masts in close proximity to the device. This unit is rated for 18KA of current surge and is very simple to install on any device.
Specification
| Application & Bands | [4G/LTE] (Band 20) |
| Country | United Kingdom |
| Boost All On | EE (4G) O2 (4G) Vodafone (4G) Three (4G) Asda (4G) BT (4G) Freedom Pop (4G) giffgaff (4G) iD Mobile (4G) Talkmobile (4G) Lyca Mobile (4G) Orange (4G) Plusnet Mobile (4G) Sky Mobile (4G) Smarty Mobile (4G) Tesco (4G) The People's Operator (4G) T-Mobile (4G) Virgin (4G) |
| Users Supporting | 25 Simultaneously |
| Band | Single Band 20 |
| Frequency | 800MHz |
| Gain(dB) | Uplink Gp≥50; Downlink Gp≥55 |
| Up-link | 832~862 MHz |
| Down-link | 791~821 MHz |
| Export Power(Po) | ≥10dBm |
| Power Adapter | Input: AC 100V~240V 50/60Hz; Output: DC 5V |
| What’s Included | 1 x Booster 1 x Outdoor Antenna 1 x Indoor Antenna 1 x UK Type Power Adapter 1 x 10 Meters Outdoor Cable 1 x 5 Meters Indoor Cable |
Custom your solution
Expandable coverage by adding indoor antenna if the outside signal is strong.
How It Works
1
The powerful antenna reaches out to access a voice and 3G, 4G, and LTE data signal, and delivers it to the booster
2
The booster receives the signal, amplifies it, and serves as a relay between your phone and the nearest cell tower.
3
Your devices get increased cell reception, and calls and data are fed through the booster back to the network.
Get stronger signal
Normal Cell Coverage
Dropped calls and slow data are generally caused by three things: distance from a cell tower, building materials in your home or office, or obstruction from tall objects such as trees, topography, and buildings.
Signal Coverage with our booster
Signal boosters increase cell signal by collecting signals with a powerful antenna, delivering those signals to the booster, amplifying the cell signals so your devices receive them, and delivering your device's boosted signals back to the cell tower.Installation
- Connect the indoor antenna to the MS port.
- Connect the outdoor antenna to the BS Port.
- Install the outdoor antenna and keep a minimum vertical distance of 10 meters from the indoor antenna.
- Point the outdoor antenna to the direction where you know there is possibly a higher signal strength from the base station.
- Power on the booster and check the signal strength.
- Adjust the outdoor antenna until you get the best signal strength.
IMPORTANT NOTE:
DO NOT POWER ON THE DEVICE UNTIL YOU HAVE COMPLETED THIS SETUP.
Read more about User Manual Documentation.
Application Scenarios
Home
Office
Garage
Metal Buildings
Specifications
| Parameter | Value |
|---|---|
| Model | C250 / MBC250gb |
| Product Type | High-Power 4G LTE Band 20 (800 MHz) Mobile Signal Booster |
| Frequency Band | Band 20 — 800 MHz (FDD LTE) |
| Uplink Frequency | 832 – 862 MHz |
| Downlink Frequency | 791 – 821 MHz |
| Supported Standards | 4G LTE (data + VoLTE calls) |
| Max Gain | Up to 72 dB |
| Max Output Power | 20 dBm (EIRP) |
| Indoor Coverage | Up to 250 m² (2,691 sq ft) |
| Noise Figure | ≤ 3.5 dB |
| Impedance | 50 Ω |
| Power Supply | AC 100–240 V, 50/60 Hz (UK plug included) |
| Power Consumption | ≤ 15 W |
| Operating Temperature | -10°C to +55°C |
| Dimensions (Booster Unit) | 200 × 130 × 30 mm |
| Weight | Approx. 650 g |
| Installation | DIY, plug-and-play, ~25 minutes |
| Ofcom Status | Licence-exempt (mobile repeater) |
What's in the Box
| Item | Quantity | Description |
|---|---|---|
| Booster Unit (C250) | 1 | High-power Band 20 800 MHz 4G amplifier with LED status indicators |
| Outdoor Omni Antenna | 1 | Wall/pole-mount, 8 dBi gain, N-type connector |
| Indoor Panel Antenna | 1 | Wall/ceiling mount, 8 dBi gain, N-type connector |
| Coaxial Cable | 1 | 10 m low-loss 5D-FB, N-type both ends |
| Power Adapter | 1 | UK 3-pin plug, AC 100–240 V |
| Mounting Hardware | 1 set | Screws, wall plugs, cable ties |
| User Manual | 1 | English installation guide |
UK Network Compatibility
| Network | Type | Band 20 4G Data | VoLTE Calls |
|---|---|---|---|
| EE | MNO | Yes | Yes |
| O2 | MNO | Yes | Yes |
| Vodafone | MNO | Yes | Yes |
| Three | MNO | Yes | Yes |
| BT Mobile | MVNO (EE) | Yes | Yes |
| Plusnet Mobile | MVNO (EE) | Yes | Yes |
| giffgaff | MVNO (O2) | Yes | Yes |
| Sky Mobile | MVNO (O2) | Yes | Yes |
| Tesco Mobile | MVNO (O2) | Yes | Yes |
| Lebara | MVNO (Vodafone) | Yes | Yes |
| VOXI | MVNO (Vodafone) | Yes | Yes |
| iD Mobile | MVNO (Three) | Yes | Yes |
| SMARTY | MVNO (Three) | Yes | Yes |
Note: The C250 amplifies 4G LTE data and VoLTE calls on Band 20. It does not boost 2G/3G voice on 900 MHz. For 2G/3G call-only boosting, see the Boost4U G150.
Pricing & Shipping
| Item | Detail |
|---|---|
| Current Price | £199.99 GBP |
| UK Shipping | Free standard delivery (10–15 business days) |
| EU / Europe Shipping | Available to DE, FR, IT, ES, NL, BE, AT, SE, DK, FI, IE, PT, PL, CZ |
| Handling Time | 1–2 business days |
| Return Policy | 365-day money-back guarantee |
| Warranty | Lifetime support |
Pros & Cons
| Pros | Cons |
|---|---|
| ✅ High 72 dB gain — strongest in Boost4U home range | ❌ 4G LTE only — does not boost 2G/3G voice (requires VoLTE) |
| ✅ 250 m² coverage for large homes and small offices | ❌ £199.99 — premium price point |
| ✅ Works with ALL four UK networks + MVNOs simultaneously | ❌ Requires 1–2 bars of outdoor 4G signal minimum |
| ✅ Low 3.5 dB noise figure for cleaner amplified signal | ❌ Outdoor antenna must be mounted on exterior wall/roof |
| ✅ 8 dBi antennas — better than standard 5–7 dBi models | ❌ Not suitable for buildings over 250 m² (see C100 for 300 m²) |
| ✅ 365-day money-back guarantee and lifetime support | ❌ 10 m cable may need upgrade for very large properties |
| ✅ Licence-exempt under Ofcom regulations | ❌ Higher power consumption (15 W) than smaller models |
How It Works
The C250 operates on a three-stage relay principle optimised for 4G LTE Band 20. The high-gain outdoor antenna captures the weak 800 MHz signal from the nearest mast and passes it via low-loss coaxial cable to the high-power booster unit. The booster amplifies the signal by up to 72 dB with an ultra-low 3.5 dB noise figure and rebroadcasts it indoors through the 8 dBi panel antenna, delivering fast 4G data and clear VoLTE calls throughout 250 m².
The system is bidirectional: it also amplifies the signal your phone sends back to the mast, ensuring both upload and download speeds improve. Advanced automatic gain control (AGC) prevents oscillation and adjusts output in real-time based on incoming signal strength, maintaining stable performance even as network conditions change.
Installation Steps
- Find the strongest outdoor 4G signal using your phone's signal meter or the Network Cell Info app.
- Mount the outdoor antenna on an exterior wall, pole or roof, pointing toward the nearest mast.
- Run the 10 m coaxial cable from the outdoor antenna to the booster unit indoors.
- Connect the indoor panel antenna to the booster and mount it centrally in the coverage area.
- Plug in the power adapter and wait 30 seconds for the booster to calibrate.
- Test 4G speeds using speedtest.net — expect 15–50+ Mbps where previously 0–5 Mbps.
Frequently Asked Questions
1. Will the C250 work with my network?
The C250 works with all four major UK networks — EE, O2, Vodafone and Three — on their Band 20 (800 MHz) 4G LTE frequency, plus all their MVNOs including BT Mobile, Plusnet, giffgaff, Sky Mobile, Tesco Mobile, Lebara, VOXI, iD Mobile and SMARTY. It is the most network-compatible high-power booster in the Boost4U range.
2. Does the C250 boost 4G internet speed?
Yes. The C250 is specifically designed to amplify 4G LTE data on Band 20 (800 MHz). In real-world testing, users report download speeds increasing from 1–5 Mbps to 20–55+ Mbps, depending on outdoor signal strength and network congestion. It also supports VoLTE for high-quality voice calls over 4G.
3. How big an area does the C250 cover?
The C250 covers up to 250 m² (approximately 2,691 sq ft) under ideal conditions with a strong outdoor signal. Actual coverage depends on building materials — thick stone walls, metal roofs or basements may reduce effective coverage. For larger properties up to 300 m², the Boost4U C100 model offers greater coverage.
4. Is the C250 legal in the UK?
Yes. The C250 is a licence-exempt mobile repeater under Ofcom regulations, provided it is installed correctly and does not cause interference to the mobile network. Ofcom legalised the use of certain mobile repeaters in 2018, and the C250 meets all technical requirements for exemption including automatic gain control and power limits.
5. Do I need an engineer to install it?
No. The C250 is designed for DIY installation. The complete kit includes all hardware, and most customers install it in 20–25 minutes using only a drill and screwdriver. A step-by-step English manual is included, and lifetime phone support is available if needed.
6. What if I have no outdoor 4G signal?
A booster cannot create signal where none exists. The C250 requires at least 1–2 bars of usable Band 20 4G signal outdoors to amplify. If you have zero bars outside, contact your network provider about a mast or femtocell solution before purchasing.
7. Will it improve my VoLTE calls?
Yes. By amplifying the 4G LTE signal, the C250 improves VoLTE (Voice over LTE) call quality and reliability. If your phone and network support VoLTE (most modern phones and all UK networks do), calls will be clearer and more stable. Without VoLTE, calls may fall back to 2G/3G which the C250 does not amplify.
8. How much does it cost to run?
The C250 consumes ≤15 W, which costs approximately £15–20 per year in electricity at current UK rates. It is designed to run continuously 24/7 and has no ongoing subscription fees or network charges.
9. Can I use it in a listed building or rented flat?
The indoor unit is compact (200 × 130 mm) and can be placed on a shelf or mounted with adhesive strips, requiring no structural changes. The outdoor antenna may require landlord permission if you rent. For listed buildings, consult your local conservation officer before drilling exterior walls.
10. What is the return policy if it doesn't work?
Boost4U offers a 365-day money-back guarantee. If the C250 does not improve your 4G signal, you can return it within 365 days for a full refund, minus shipping costs. The company also provides lifetime technical support to help optimise installation and antenna placement.
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Why You'll Love It
Powerful Signal Boost
Easy Installation
Networks Supported
Fast Speeds
Crystal Clear Calls
Wide Coverage Area
Award-Winning Signal Booster
2026 Winner
Smart Features, Made Simple
Easy Setup
Smart Technology
Energy Efficient
Reliable Performance
24/7 Support
Secure & Safe
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