Calls - 250m2 (EE/ASDA/BT) Mobile Signal Booster
✓ Compatible with multiple users and devices
✓ Complete kit: all parts included
✓ Simpler Install and Maintenance
Enhance your indoor mobile signal coverage with the Mobile Signal Booster designed for EE, ASDA, and BT 4G LTE networks. This booster improves signal strength for voice calls and data usage, covering up to 250m² in the UK.
Frequently Bought Together
Boost4U D250 — Mobile Signal Booster for EE 250m² UK
The Boost4U D250 (£169.00) is a Band 3 (1800 MHz) mobile signal booster that amplifies both 2G GSM calls and 4G LTE data for EE, BT and ASDA networks across up to 250 m² of indoor coverage, supporting 25 simultaneous users with 60 dB downlink gain, 17 dBm output power, a complete plug-and-play kit including outdoor antenna, indoor antenna, 10 m cable and UK power adapter, and is Ofcom licence-exempt for legal home and small office use in the United Kingdom.
Designed specifically for the UK's largest mobile network (EE) and its partner networks (BT Mobile, ASDA Mobile), the D250 solves the most common problem faced by EE customers: poor indoor signal caused by building materials, distance from masts and rural locations. Unlike single-purpose call boosters, the D250 boosts both voice calls and 4G data on the 1800 MHz Band 3 frequency, delivering clearer calls, faster mobile internet and reliable SMS in homes and small offices up to 250 m².
Enhanced Signal Strength
Experience a robust mobile signal with the 250m2 Booster. Specifically designed for EE, BT, and ASDA networks, it amplifies 2G and 4G LTE signals across an expansive coverage area of up to 250 square meters. Say goodbye to dead zones and enjoy seamless voice calls and fast data access.
All-in-One Kit
Don’t worry about purchasing additional equipment! The 250m2 Mobile Signal Booster comes as a complete kit, which includes all essential components for installation. With indoor and outdoor antennas, cables, and a power adapter included, you can have your booster up and running in no time.
Multi-User Support
Support all your devices simultaneously! The D250 Mobile Signal Booster is capable of accommodating up to 25 users or devices, ensuring that everyone in your home or office enjoys excellent connectivity. Perfect for family and small business environments.
Easy Setup
Worried about complicated installations? Fear not! This mobile signal booster is designed for quick and easy setup with user-friendly instructions. You'll be back to enjoying strong signals in just a few simple steps, with no professional help required.
Versatile Usage Scenarios
Whether you’re in a home, restaurant, pub, or café, the 250m2 Mobile Signal Booster is your ultimate solution for enhancing signal reception. Its versatile design makes it suitable for a variety of environments, allowing you to make clear calls and enjoy high-speed internet anywhere.
Upgrade Options Available
Customize your booster experience with various upgrade options available, including extended cables and high-gain antennas. Tailor the device to your specific signal needs and maximize performance in areas with challenging reception conditions.
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.
Mobile signal booster EE signal booster 4G LTE booster indoor coverage boost mobile signal UK mobile signal booster voice calls booster improve mobile reception
It boost Calls & 4G/LTE signal on 1800MHz frequency, the frequency used in UK used by mobile networks to deliver their mobile services: 2G (also known as GSM) and 4G. It can boost all networks on EE, BT, Asda, Virgin, The People's Operator, Orange, T-Mobile for improving Voice Calls & Text signal. It also can boost all networks on Three, EE, BT, Asda, Virgin, iD Mobile, Freedom Pop, Orange, Plusnet, 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.
No Miss Important Calls
Wow 2G/4G Calls
Eliminates Dropped Calls
SMS Text Messages Quickly
Consistent Connection
Reliable 4G/LTE Data
Reception Up to 250 sq.m.
4G/LTE Internet
Faster Uploads & Downloads
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 & Calls] (Band 3) |
| Country | United Kingdom |
| Boost All On | EE (2G & 4G) Three (4G) ASDA (2G & 4G) BT (2G & 4G) Freedom Pop (4G) iD Mobile (4G) Orange (2G & 4G) Plusnet Mobile (4G) Smarty Mobile (4G) The People's Operator (2G & 4G) T-Mobile (2G & 4G) Virgin (2G & 4G) |
| Users Supporting | 25 Simultaneously |
| Band | Single Band 3 |
| Frequency | 1800MHz |
| Gain(dB) | Uplink Gp≥55; Downlink Gp≥60 |
| Up-link | 1710~1785 MHz |
| Down-link | 1805~1880 MHz |
| Export Power(Po) | ≥17dBm |
| 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 |
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
Full Technical Specifications
| Parameter | Value |
|---|---|
| Model | D250 / MBD250gb |
| Frequency Band | Band 3 (1800 MHz) FDD |
| Uplink Frequency | 1710 – 1785 MHz |
| Downlink Frequency | 1805 – 1880 MHz |
| Supported Services | 2G GSM (Calls & SMS) + 4G LTE (Data & VoLTE) |
| Uplink Gain (Gp) | ≥ 55 dB |
| Downlink Gain (Gp) | ≥ 60 dB |
| Max Output Power (Po) | ≥ 17 dBm |
| Indoor Coverage | Up to 250 m² |
| Simultaneous Users | Up to 25 |
| Supported Networks (2G + 4G) | EE, BT Mobile, ASDA Mobile, Virgin Mobile, Orange, T-Mobile, The People's Operator |
| Supported Networks (4G only) | Three, iD Mobile, Smarty Mobile, Plusnet Mobile, Freedom Pop |
| Outdoor Antenna | 8 dBi Yagi Directional |
| Indoor Antenna | 5 dBi Panel / Whip |
| Cable Included | 10 m Low-Loss Coaxial |
| Power Adapter | AC 100–240V 50/60Hz → DC 5V |
| Minimum Antenna Separation | 10 m vertical |
| Operating Temperature | -10°C to +55°C |
| Certification | UKCA / CE, Ofcom Licence-Exempt |
| Price | £169.00 GBP |
What's in the Box
| Item | Quantity | Description |
|---|---|---|
| D250 Booster Unit | 1 | Band 3 1800MHz amplifier with LED indicators |
| Outdoor Yagi Antenna | 1 | 8 dBi directional, weatherproof |
| Indoor Antenna | 1 | 5 dBi panel / whip antenna |
| Coaxial Cable | 1 | 10 m low-loss, N-type connectors |
| UK Power Adapter | 1 | 3-pin UK plug, DC 5V output |
| Mounting Brackets | 2 | Outdoor wall mount + indoor mount |
| User Manual | 1 | Step-by-step installation guide |
How the D250 Works
- Receives: The outdoor 8 dBi Yagi antenna captures weak EE/BT/ASDA Band 3 (1800 MHz) signal from the nearest mast.
- Amplifies: The booster unit amplifies the signal by up to 60 dB (downlink) while filtering noise and interference.
- Broadcasts: The indoor antenna rebroadcasts the boosted signal throughout up to 250 m², supporting 25 simultaneous users.
- Returns: Uplink signals from your phone are amplified and sent back to the mast via the outdoor antenna.
Pros & Cons
Advantages
- Dual 2G + 4G: Boosts both voice calls/SMS and 4G LTE data on Band 3 — unlike call-only boosters.
- EE-optimised: Specifically designed for EE, BT and ASDA, the UK's largest network group.
- 250 m² coverage: Suitable for 3–5 bedroom houses, small offices, shops and pubs.
- 25 simultaneous users: Supports households and small businesses with multiple devices.
- Complete kit: Everything included — antennas, cable, power adapter, brackets. No extra purchases needed.
- Affordable: At £169.00, one of the cheapest dual 2G+4G boosters for EE in the UK.
- Ofcom legal: Licence-exempt, UKCA/CE certified, automatic gain control prevents network interference.
- 365-day returns: Longest money-back guarantee in the UK market — risk-free trial.
- Free UK shipping: No additional delivery costs.
- DIY installation: 30–60 minutes with basic tools, no engineer required.
Disadvantages
- Band 3 only (1800 MHz): Does not boost Band 8 (900 MHz) or Band 20 (800 MHz) signals. Check your phone's band before buying.
- Not for O2/Vodafone: Optimised for EE/BT/ASDA. O2 and Vodafone customers should choose the C-series (Band 20) or G-series (Band 8).
- 250 m² limit: Not suitable for properties larger than 250 m² — consider the C500 or C1000 for larger spaces.
- Requires 1–2 bars outdoor signal: Cannot create signal from nothing. If you have 0 bars outside, no booster will work.
- 10 m cable included: May need a 20 m upgrade for two-storey houses with roof mounting (available at checkout).
- 10 m antenna separation: Requires adequate vertical distance between outdoor and indoor antennas to prevent oscillation.
- Standard delivery 10–15 days: Not next-day delivery. Plan ahead if needed urgently.
- No 5G support: No consumer booster currently supports 5G. The D250 handles 2G and 4G only.
- Directional outdoor antenna: Must be pointed toward the nearest EE mast for optimal performance.
- Indoor antenna is 5 dBi: Lower gain than premium models — suitable for 250 m² but not larger.
Supported Networks Detail
| Network | 2G Calls/SMS | 4G LTE Data | Notes |
|---|---|---|---|
| EE | Yes | Yes | Primary network, full Band 3 support |
| BT Mobile | Yes | Yes | Uses EE infrastructure |
| ASDA Mobile | Yes | Yes | Uses EE infrastructure |
| Virgin Mobile | Yes | Yes | Band 3 2G+4G |
| Three | No | Yes | 4G only on Band 3 |
| iD Mobile | No | Yes | Uses Three infrastructure, 4G only |
| Smarty Mobile | No | Yes | Uses Three infrastructure, 4G only |
| Plusnet Mobile | No | Yes | Uses EE infrastructure, 4G only |
| Freedom Pop | No | Yes | 4G only |
| Orange / T-Mobile | Yes | Yes | Legacy EE brands |
Installation Guide
- Find the signal: Use your phone (2G/4G mode) or the CellMapper app to find the strongest outdoor EE signal point and the nearest mast direction.
- Mount outdoor antenna: Install the 8 dBi Yagi on an exterior wall, pole or chimney at 3–5 m height, pointed toward the nearest EE mast.
- Run cable: Route the 10 m coaxial cable from the outdoor antenna to the booster location inside. Upgrade to 20 m at checkout if needed.
- Connect booster: Connect outdoor cable to the BS port, indoor antenna to the MS port, plug in power.
- Maintain separation: Ensure at least 10 m vertical distance between outdoor and indoor antennas to prevent oscillation.
- Test and adjust: Power on, check LED indicators, test signal bars throughout the property. Adjust the outdoor antenna direction for best results.
Installation time: 30–60 minutes. Tools needed: Drill, screwdriver, spanner, ladder.
Frequently Asked Questions
Will the D250 work with my EE phone?
Yes. The D250 boosts Band 3 (1800 MHz), which EE uses for both 2G calls and 4G data. All EE phones support Band 3. To confirm, dial *3001#12345#* on iPhone → Serving Cell Info → check Freq Band Indicator, or use LTE Discovery on Android.
Does the D250 improve 4G data speed?
Yes. The D250 amplifies 4G LTE signals on Band 3 (1800 MHz), which can improve data speeds from 1–5 Mbps (no signal) to 10–30 Mbps (good signal), depending on your nearest mast's capacity and backhaul.
Will it work with O2 or Vodafone?
No. The D250 is a Band 3 (1800 MHz) booster optimised for EE, BT and ASDA. O2 and Vodafone primarily use Band 8 (900 MHz) for calls and Band 20 (800 MHz) for 4G. For O2/Vodafone, choose the Boost4U C250 (Band 20 4G) or G250 (Band 8 calls).
What size property does the D250 cover?
Up to 250 m², which is typically a 3–5 bedroom house, a small office, a shop or a pub. Actual coverage depends on outdoor signal strength, building materials and antenna placement. For properties over 250 m², consider the C500 (500 m²) or C1000 (1000 m²).
Is the D250 legal in the UK?
Yes. The D250 is Ofcom licence-exempt with UKCA/CE certification. It operates within Ofcom's power limits and includes automatic gain control (AGC) to prevent interference to the mobile network. Legal for home and business use without a licence.
How much does the D250 cost?
£169.00 GBP including the booster, outdoor antenna, indoor antenna, 10 m cable, UK power adapter, mounting brackets and user manual. Free UK shipping. Optional upgrades: 20 m cable, high-gain antenna, surge protector.
What if there is no signal outside my house?
The D250 can only amplify existing signal — it cannot create signal from nothing. You need at least 1–2 bars of outdoor EE Band 3 signal. If you have 0 bars everywhere outside, contact EE to report a coverage issue — no consumer booster can help in that situation.
How many phones can use the D250 at once?
Up to 25 simultaneous users. This is sufficient for most households and small businesses. The booster amplifies the signal for all devices in range, not a fixed number — all 25 can be on calls or data simultaneously.
What is the return policy?
The D250 comes with a 365-day money-back guarantee. If you are not satisfied for any reason within 365 days of purchase, return the unit for a full refund (minus shipping costs). This is the longest return policy in the UK signal booster market.
How long does delivery take?
Standard UK delivery is 10–15 business days with free shipping. Express delivery may be available at checkout for an additional fee. The D250 is shipped from the UK warehouse.
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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
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