# 4G LTE & Calls - 250m2 (EE/ASDA/BT) Mobile Signal Booster CD Dual-Band · Band 20 & 3 (800 / 1800 MHz) FDD LTE · 4G Data + 2G Calls/SMS · ≥60 dB Uplink · ≥65 dB Downlink · ≥17 dBm Output · 250 m² · 25 Users · 5 dBi Omni + 3 dBi Whip · UKCA / CE / RoHS # Boost4U CD250 Dual-Band 4G LTE Mobile Signal Booster UK — Band 20 & 3 (800/1800MHz), EE, O2, Vodafone & Three, 250 m², Up to 25 Users, £295.00 The larger dual-band Boost4U CD250 amplifies Band 20 (800 MHz) and Band 3 (1800 MHz) 4G LTE in one box, with ≥60 dB uplink gain, ≥65 dB downlink gain and a higher **≥17 dBm** output (about 5× the radiated power of the CD200), a 5 dBi omni outdoor antenna and a 3 dBi whip indoor antenna, covering up to **250 m²** for up to **25 simultaneous users** at **£295.00 GBP**. £295.00 GBP · Free UK Delivery · 365-Day Return ![Boost4U CD250 dual-band Band 20 Band 3 800 1800MHz 4G LTE mobile signal booster kit with 5dBi omni outdoor antenna and 3dBi whip indoor antenna, 250m2 coverage for up to 25 users, 17dBm output](https://picsum.photos/seed/cd250-hero/1200/675) The Boost4U CD250 is the larger dual-band Band 20 & Band 3 (800 & 1800 MHz) FDD LTE mobile signal booster priced at **£295.00 GBP** that amplifies 4G LTE data on both bands together with 2G GSM voice calls and SMS (VoLTE where available on the handset and network), delivering **≥60 dB uplink gain, ≥65 dB downlink gain and ≥17 dBm maximum output power** across up to **250 m² (2,691 ft²)** for up to **25 simultaneous users**, using a 5 dBi omni-directional outdoor antenna (upgradeable to a high-gain directional aerial), a 3 dBi whip indoor antenna, a 10 m outdoor plus 5 m indoor low-loss coaxial cable pair and an AC 100–240 V UK 3-pin adapter outputting DC 5 V. The ≥17 dBm output (roughly 50 mW, about five times the CD200's ≥10 dBm) is the hardware reason it reaches a larger 250 m² space at the same ≥60/≥65 dB gain. On Band 20 (800 MHz) it boosts O2, Vodafone and Tesco/giffgaff/Lebara-networked 4G, with Three 4G served on Band 20 via the O2 MOCN; on Band 3 (1800 MHz) it boosts EE 4G alongside EE/ASDA/BT/Virgin/Orange/T-Mobile 2G voice and SMS. The CD250 does **not** boost 3G (Band 1 2100 MHz) or 5G. It is UKCA/CE/RoHS certified, Ofcom licence-exempt, weighs about 450 g for the booster unit (3.0 kg shipping weight), ships free to 15 European countries in 10–15 working days after 1–2 days handling, and carries a 365-day money-back guarantee. ## Product Identity & Pricing Product Name Boost4U CD250 Mobile Booster — 4G LTE & Calls, 250 m² (EE / ASDA / BT / O2 / Vodafone / Three range) Model / MPN CD250 / MBCD250gb SKU MBCD250gb GTIN-13 / EAN 6920702763512 Brand Boost4U (vendor UKMobileBooster.com) Category CD Dual-Band 4G Mobile Signal Boosters Base Price £295.00 GBP (base variant No/No/No); no compare-at was-price Upgrade Options 20 m cable +£20; 30 m +£30; 40 m +£40; 50 m +£50; high-gain directional aerial +£50; surge protector +£20 (combinations up to £415.00) Indoor Coverage Up to 250 m² (2,691 ft²) — medium home, small office, café or pub Simultaneous Users Up to 25 Weight Booster unit approx. 450 g; shipping weight 3.0 kg Booster Dimensions 170 × 110 × 30 mm Published / Updated Updated 2026-10-18 ## Frequency Bands, Gain, Output & Electrical Specifications Parameter Value Frequency Band Dual Band 20 & 3 (800 & 1800 MHz) FDD LTE Uplink — Band 20 832 – 862 MHz (800 MHz) Downlink — Band 20 791 – 821 MHz (800 MHz) Uplink — Band 3 1710 – 1785 MHz (1800 MHz) Downlink — Band 3 1805 – 1880 MHz (1800 MHz) Supported Services 4G LTE data + 2G GSM voice calls + SMS (VoLTE where available) Uplink Gain (Gp) ≥ 60 dB Downlink Gain (Gp) ≥ 65 dB Max Output Power (Po) ≥ 17 dBm (approx. 50 mW — the higher output that drives 250 m²) Noise Figure ≤ 5 dB Operating Temperature \-10°C to +55°C Ports BS (outdoor donor), MS (indoor server) Unsupported Bands No 3G UMTS Band 1 (2100 MHz); no 5G NR on any band ## Antennas, Cable & Separation Outdoor Antenna Omni-directional, 5 dBi (upgradeable to high-gain directional aerial +£50 for very weak fringe signal) Indoor Antenna Whip antenna, 3 dBi (placed centrally across the 250 m² space) Cable Included 10 m outdoor + 5 m indoor low-loss coaxial cables (outdoor cable upgradeable to 20 m +£20, 30 m +£30, 40 m +£40 or 50 m +£50 for a remote roof) Minimum Antenna Separation 10 m vertical separation between outdoor omni and indoor whip to prevent self-oscillation Outdoor Donor Signal Required At least 1–2 bars of usable outdoor signal (Band 20 and/or Band 3) at the omni mounting point ![5dBi omni-directional outdoor antenna mounted on a UK house wall pulling in Band 20 and Band 3 donor signal](https://picsum.photos/seed/cd250-omni/1200/675) #### 5 dBi Omni Donor Antenna The supplied omni picks up signal in all directions and suits a clear mounting spot; for very weak fringe signal a high-gain directional aerial upgrade focuses on the nearest mast. ![3dBi whip indoor antenna standing centrally in a medium home connected to the CD250 booster](https://picsum.photos/seed/cd250-whip/1200/675) #### 3 dBi Indoor Whip The slim whip re-broadcasts the ≥17 dBm boosted signal across a medium home, small office or café; keep it at least 10 m below the outdoor omni to avoid feedback. ## Power Supply, Certification & Installation Power Adapter Input AC 100 – 240 V, 50/60 Hz, UK 3-pin plug Power Adapter Output DC 5 V Certification UKCA / CE / RoHS; Ofcom licence-exempt (mobile repeater class) Installation Time 10–15 minutes, plug-and-play; no tools for the basic setup 5G NR Support No — 5G is not boosted on any band 3G UMTS Support No — Band 1 (2100 MHz) 3G is not boosted; relies on 4G VoLTE for calls where offered Display / Meter No LCD signal-strength meter; status is read from LED indicators and a phone's bar count Warranty / Returns 365-day money-back guarantee; return shipping deducted from refund Delivery Free shipping; handling 1–2 working days, UK transit 10–15 working days; 15 destination countries ## UK Network Compatibility Matrix Carrier / MVNO Service Boosted Notes O2 4G LTE (Band 20 800 MHz) 4G data on Band 20; 2G voice on 900 MHz not covered, use VoLTE where available Vodafone 4G LTE (Band 20 800 MHz) 4G data on Band 20; 2G voice on 900 MHz not covered, use VoLTE where available Three 4G LTE (Band 20 via O2 MOCN) Three 4G rides Band 20 on the shared O2 network; no 2G voice on Three giffgaff 4G LTE (Band 20, O2 network) O2-networked MVNO; 4G data boosted on Band 20 Tesco Mobile 4G LTE (Band 20, O2 network) O2-networked MVNO; reliable rural 4G per customer reviews Lebara 4G LTE (Band 20, Vodafone network) Vodafone-networked MVNO; 4G data boosted Lycamobile / iD Mobile / Smarty / Plusnet / Freedom Pop / Sky Mobile 4G LTE (Band 20 / Band 3 data) 4G-only MVNOs on the O2, Vodafone or Three infrastructure listed on the product page EE 4G LTE (Band 3 1800 MHz) + 2G calls/SMS Full 4G on Band 3 plus 2G voice and SMS on the EE GSM layer ASDA Mobile 2G calls/SMS + 4G LTE Uses EE infrastructure; Band 3 4G plus 2G voice BT Mobile 2G calls/SMS + 4G LTE Uses EE infrastructure; Band 3 4G plus 2G voice Virgin Mobile / Orange / T-Mobile / The People's Operator 2G calls/SMS + 4G LTE EE-networked or legacy EE brands; Band 3 4G plus 2G voice ## What's in the Box CD250 Booster Unit 1 × indoor dual-band Band 20+3 amplifier with status LED indicators (power, Band 20, Band 3) Outdoor Antenna 1 × 5 dBi omni-directional outdoor antenna, wall/eave mount Indoor Antenna 1 × 3 dBi whip indoor antenna Outdoor Coax 1 × 10 m low-loss outdoor coaxial cable (outdoor upgradeable to 20/30/40/50 m) Indoor Coax 1 × 5 m low-loss indoor coaxial cable to the whip Power Adapter 1 × AC 100–240 V 50/60 Hz UK 3-pin adapter, DC 5 V output Mounting Parts Basic mounting hardware for the omni and whip Documentation English user manual with plug-and-play install guide and support card ![Complete CD250 dual-band booster kit laid out: amplifier unit, 5dBi omni outdoor antenna, 3dBi whip, 10m outdoor and 5m indoor coax, UK power adapter](https://picsum.photos/seed/cd250-kit/1200/675) #### Complete Kit Everything for a basic DIY install arrives in one box; no separate antenna or cable purchase required at the base price, with paid cable and high-gain aerial upgrades available for weak or remote sites. ## Pros & Cons — Honest Review ### Pros - The larger dual-band unit that covers all four UK operators' 4G in one box: Band 20 (800 MHz) for O2/Vodafone/Three and Band 3 (1800 MHz) for EE, at £295.00. - Up to 250 m² coverage for up to 25 simultaneous users, suited to a medium home, small office, café or small pub. - ≥60 dB uplink and ≥65 dB downlink gain with ≤5 dB noise figure, plus a higher ≥17 dBm output that radiates roughly 5× the power of the CD200 to reach the larger area. - Plug-and-play 10–15 minute setup with no tools; no engineer visit, no Ofcom licence, no monthly fee and no new SIM contract. - EE customers receive 4G on Band 3 plus 2G calls/SMS; O2, Vodafone and Three customers receive boosted 4G data on Band 20. - Supplied complete with 5 dBi omni outdoor antenna, 3 dBi whip, 10 m outdoor + 5 m indoor coax and UK 3-pin adapter; outdoor cable and high-gain aerial are upgradeable. - UKCA/CE/RoHS certified and Ofcom licence-exempt; 365-day money-back guarantee and free shipping to 15 European countries. ### Cons - Coverage tops out at 250 m² — it will not cover a large detached house, multi-storey building or whole commercial premises; larger spaces need a higher-capacity system. - No 3G (Band 1 2100 MHz) and no 5G on any band; calls rely on 4G VoLTE where the network and handset support it. - At ≥17 dBm this is a stronger repeater-class indoor unit, not a licensed high-power outdoor booster; it cannot solve a site with no donor signal outside. - The supplied 5 dBi omni outdoor antenna may need the paid high-gain directional upgrade where donor signal is very weak. - The included 10 m outdoor cable may need the 20/30/40/50 m upgrade when the roof or mounting point is far from the room. - Outdoor omni and indoor whip need 10 m vertical separation to prevent self-oscillation, which open-plan layouts can struggle to fit. - Free delivery takes 10–15 working days after 1–2 days handling — it is not next-day. - The indoor 3 dBi whip covers the central area only; the unit has no LCD signal-strength meter to tune alignment. ## Where the CD250 Works ![UK medium home living room, kitchen and bedroom connected areas with the CD250 dual-band booster giving full 4G bars across 250m2](https://picsum.photos/seed/cd250-home/1200/675) #### Medium Home (Up to 250 m²) A three-bedroom terraced or semi home or compact detached where EE, O2, Vodafone and Three phones hold 4G and calls across connected rooms, up to 25 family devices. ![Small UK office with up to 25 staff phones holding 4G video calls thanks to the CD250](https://picsum.photos/seed/cd250-office/1200/675) #### Small Office (Up to 25 Users) A compact office, reception or workshop where up to 25 phones and data SIMs keep video calls connected and data flowing under the 25-user cap. ![Small UK cafe or pub dining area with card terminals and customer phones on boosted 4G from the CD250](https://picsum.photos/seed/cd250-cafe/1200/675) #### Café / Small Pub / Shop Floor A café bar, small pub dining room or shop floor where card terminals, staff devices and customer phones stay connected across roughly 250 m². ![Steel-clad workshop or metal farm building on a UK plot boosted by the CD250 overcoming signal blockage](https://picsum.photos/seed/cd250-metal/1200/675) #### Metal Building / Workshop / Barn A compact steel workshop, insulated barn or metal building that normally blocks signal; the omni pulls fringe Band 20/Band 3 donor signal and the ≥17 dBm output re-broadcasts it inside the 250 m² shell. ## Frequently Asked Questions — Real UK Dual-Band 4G User Questions How does the CD250 dual-band booster differ from the CD200 and the single-band C250? The CD200 shares the same Band 20+3 dual bands and ≥60/≥65 dB gain but outputs ≥10 dBm and covers up to 200 m² for 20 users; the CD250 keeps the same gain but raises output to ≥17 dBm and reaches 250 m² for 25 users. The C250 is a single Band 20 (800 MHz) unit that boosts O2/Vodafone 4G but misses EE Band 3 4G and voice. Choose the CD250 for a medium home, small office or café where 250 m² and 25 users matter; step down to the CD200 for 200 m², and choose the C250 only if you are O2/Vodafone-only and do not need EE. What is the difference between Band 20 (800MHz) for O2/Vodafone and Band 3 (1800MHz) for EE on the CD250? Band 20 (800 MHz) is the rural propagation band used by O2 and Vodafone for 4G, reaching further over distance and through obstacles; Three 4G rides Band 20 over the shared O2 MOCN. Band 3 (1800 MHz) carries EE 4G alongside the EE 2G GSM layer for calls and SMS. The CD250 amplifies both simultaneously, so an O2 phone and an EE phone in the same premises both get boosted 4G without switching boxes. How much area does "up to 250m²" really cover, and which UK homes or venues fit the CD250? Up to 250 m² (2,691 ft²) means a medium three-bedroom terraced or semi home, a compact detached, a small office, or a café/small pub dining room. It is not a whole-house solution for a large detached, three-storey or sprawling commercial premises; the 4-star review from Lisa P. notes it covers the living room and kitchen but a bigger model would be needed for the whole house. Solid walls, metal shelving and distance from the whip shrink the usable area. How do 25 simultaneous users work on the CD250? The CD250 supports up to 25 phones or data devices connected at the same time, sharing the boosted Band 20 and Band 3 capacity. This suits a small office team, a busy family home, or a café/small shop floor. Beyond 25 active users the shared RF capacity thins out; a large open-plan office or full pub needs a higher-capacity distributed system. It is connected capacity, not a guaranteed 25 fast-speed lines at once. What do ≥60dB uplink, ≥65dB downlink gain and the ≥17dBm output mean? Gain in dB measures how much the amplifier strengthens the signal: ≥60 dB uplink lifts your phone's signal back up to the mast, and ≥65 dB downlink lifts the mast's signal down to your phone. Output in dBm measures the final radiated strength: ≥17 dBm is about 50 mW, roughly five times the CD200's ≥10 dBm (≈10 mW), and that higher radiated power is what reaches across 250 m². Gain and output work together — high gain without enough output still leaves corners weak. Why does the CD250 use ≥17dBm while the CD200 uses ≥10dBm? The CD250's higher ≥17 dBm output is the hardware difference that covers a larger 250 m² space; both models share the same ≥60/≥65 dB gain, so the extra coverage comes from radiated power, not more amplification. The unit remains in the Ofcom licence-exempt mobile repeater class; it is not a licensed high-power outdoor transmitter. Choose CD250 for the bigger footprint, CD200 for 200 m² where the higher output is unnecessary. Should I use the included 5dBi omni outdoor antenna, or upgrade to a directional Yagi? The supplied 5 dBi omni works well when you have a clear, unobstructed mounting spot with 1–2 bars outside and do not need to aim at a specific mast. Where donor signal is very weak, or the mast lies in one direction behind a ridge or trees, the paid high-gain directional aerial (+£50) focuses the pickup on that mast and often makes the difference between marginal and solid. Start with the omni, read the bar count, and upgrade only if signal stays weak. How much outdoor donor signal does the CD250 need before it can work? At least 1–2 bars of usable outdoor signal on Band 20 and/or Band 3 at the omni mounting point, checked with a phone outside on the wall, roof or eave. A booster amplifies the donor signal it receives; it cannot create signal where none exists outside. If your phone shows zero bars and emergency calls only even at the mounting point, this unit will not work, and neither will any Ofcom-legal booster at this price. What does the 365-day return policy cover, and how long does delivery take? The CD250 carries a 365-day money-back guarantee: if it does not work for your location, return it by mail within 365 days for a refund; return shipping is deducted from the refund (ReturnShippingFees), so it is not a free-return label. Standard delivery is free: handling takes 1–2 working days and UK transit 10–15 working days, so it is not next-day, and the same policy covers 15 European countries (GB, DE, FR, IT, ES, NL, BE, AT, SE, DK, FI, IE, PT, PL, CZ). Does the CD250 support VoLTE, and will it boost 5G or 3G? The CD250 boosts 4G LTE data and 2G calls/SMS; calls over 4G work when your handset and network offer VoLTE (Voice over LTE), which O2, Vodafone, EE and Three support on compatible plans. It does not boost 5G NR on any band and it does not boost 3G UMTS Band 1 (2100 MHz), so a device stuck on 3G fallback will not be helped. If 5G speed or 3G fallback is the main requirement, a different unit on those bands is needed. ## Learn More: CD250 Guides & Comparisons [ #### Best Dual-Band 250m² Booster UK — Buyer's Guide How to choose a Band 20+3 budget booster with 17dBm output that covers EE, O2, Vodafone and Three 4G across a medium home, small office or café. ](https://www.ukmobilebooster.com/blogs/news/cd250-dual-band-signal-booster-review-2026-best-250m-4g-lte-booster-with-17dbm-output-for-ee-o2-vodafone-and-three-uk-homes)[ #### CD250 vs CD200 vs C250 Honest UK comparison of the larger ≥17dBm CD250 against the CD200 and the single-band C250. ](https://www.ukmobilebooster.com/blogs/news/cd250-vs-cd200-vs-c250-which-boost4u-dual-band-or-single-band-booster-covers-250m-uk-homes-and-small-offices-in-2026)[ #### 250m² Dual-Band Booster Installation Guide Omni placement, 10 m outdoor + 5 m indoor cable routing, 10 m antenna separation and signal testing for a medium UK home or office. ](https://www.ukmobilebooster.com/blogs/news/cd250-installation-guide-250m2-dual-band-4g-signal-booster-setup-17dbm-output-omni-antenna-placement-and-cable-routing-for-uk-medium-homes-small-offices-cafes-and-pubs)[ #### Band 20+3: EE, O2, Vodafone & Three Explained Why O2/Vodafone/Three ride Band 20 and EE rides Band 3, and how the CD250 dual-band matrix covers all four operators. ](https://www.ukmobilebooster.com/blogs/news/cd250-band-20-band-3-explained-how-the-17dbm-dual-band-booster-covers-ee-o2-vodafone-and-three-4g-across-250m2-in-the-uk) ##### **Enhanced 4G LTE Coverage** Experience superior 4G LTE signal strength with our Mobile Signal Booster, designed to cover up to 250m². Say goodbye to dropped calls and slow data speeds, ensuring seamless connectivity for your home or business. ![4G LTE Mobile Signal Booster UK Networks EE Vodafone O2 Indoor Coverage Improve Signal Feature](https://cdn.shopify.com/s/files/1/0488/4129/3976/files/Signal-Booster-Feature1-1.png?v=1780277092) ##### **Universal Compatibility** This booster is compatible with major UK networks including EE, BT, and ASDA, making it an essential solution for households with multiple mobile providers. Enjoy reliable service regardless of your carrier. ![4G LTE Mobile Signal Booster UK Networks EE Vodafone O2 Indoor Coverage Improve Signal Feature](https://cdn.shopify.com/s/files/1/0488/4129/3976/files/Signal-Booster-Feature2.png?v=1780223075) ##### **Easy Installation** Our Mobile Signal Booster comes with a complete kit, including all necessary components for a hassle-free setup. With straightforward instructions, you can boost your signal in no time. ![4G LTE Mobile Signal Booster UK Networks EE Vodafone O2 Indoor Coverage Improve Signal Feature](https://cdn.shopify.com/s/files/1/0488/4129/3976/files/Signal-Booster-Feature3.png?v=1780223075) ##### **Supports Multiple Users** Designed to accommodate up to 25 simultaneous users, this booster ensures that everyone in your household can enjoy enhanced signal strength for calls, texts, and data without interruptions. ![4G LTE Mobile Signal Booster UK Networks EE Vodafone O2 Indoor Coverage Improve Signal Feature](https://cdn.shopify.com/s/files/1/0488/4129/3976/files/Signal-Booster-Feature4.png?v=1780223075) ##### **Dual Band Technology** Utilizing dual band technology, this booster amplifies signals on both 800MHz and 1800MHz frequencies, providing comprehensive coverage for 4G LTE and 2G networks, ensuring you stay connected. ![4G LTE Mobile Signal Booster UK Networks EE Vodafone O2 Indoor Coverage Improve Signal Feature](https://cdn.shopify.com/s/files/1/0488/4129/3976/files/Signal-Booster-Feature5.png?v=1780223075) ##### **Reliable Performance** With a gain of up to 65dB, our Mobile Signal Booster guarantees a consistent and reliable connection, allowing you to make clear voice calls and enjoy fast data speeds, even in challenging signal areas. ![4G LTE Mobile Signal Booster UK Networks EE Vodafone O2 Indoor Coverage Improve Signal Feature](https://cdn.shopify.com/s/files/1/0488/4129/3976/files/Signal-Booster-Feature6.png?v=1780223075) ## **3 Steps to Full Bars** ## 1\. Place the Outdoor Antenna Mount the antenna where you get the best signal. ![4G LTE Mobile Signal Booster UK Networks EE Vodafone O2 Indoor Coverage Improve Signal Install](https://cdn.shopify.com/s/files/1/0488/4129/3976/files/Install-1.gif?v=1780223819) ## 2\. Connect the Booster Inside Plug in the booster and connect to the antenna. ![4G LTE Mobile Signal Booster UK Networks EE Vodafone O2 Indoor Coverage Improve Signal Install](https://cdn.shopify.com/s/files/1/0488/4129/3976/files/Install-2.gif?v=1780223819) ## 3\. Enjoy Full Bars Everywhere Clear calls, fast data, and no more dead zones. ![4G LTE Mobile Signal Booster UK Networks EE Vodafone O2 Indoor Coverage Improve Signal Install](https://cdn.shopify.com/s/files/1/0488/4129/3976/files/Install-3.gif?v=1780223819) ## 4G LTE Mobile Signal Booster EE Mobile Booster ASDA Signal Booster BT Mobile Signal 250m2 Coverage UK Mobile Signal Mobile Network Enhancement It boost **All 4G/LTE and Calls** signal on 800MHz, 1800MHz frequency, the frequencies used in UK and Europe used by mobile networks to deliver their mobile services: 4G and 2G (also known as GSM). It can boost UK and Europe all network operators 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 also can boost UK all networks on EE, BT, Asda, Virgin, The People's Operator, Orange, T-Mobile for improving **Calls & Texts** signal. The booster is the best suitable for medium size, boost indoor signal areas up to **250 m2**, perfect for home, cafes, restaurants, pubs, clubs and more. The system is designed for universal 4G coverage. Unlike other kits this device will boost ALL mobile providers' 4G LTE, the solution will provide coverage on on both 800MHz, 1800MHz frequency **simultaneously**. It's Dual Band booster and is an **ESSENTIAL** if many people in the same household are on different mobile phone networks! * * * **Wow 4G/2G Calls** Eliminates Dropped Calls **Clear Voice** No Miss Important Calls **Consistent Connection** Reliable 4G/LTE Data **Send/Receive SMS** SMS Text Messages Quickly **4G/LTE Internet** Faster Uploads & Downloads **Signal Wider Coverage** 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. ![4G LTE Mobile Signal Booster EE Mobile Booster ASDA Signal Booster BT Mobile Signal 250m2 Coverage UK Mobile Signal Mobile Network Enhancement cables](https://cdn.shopifycdn.net/s/files/1/0488/4129/3976/files/ProductPageCable.webp?v=1600639912) * * * ### 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](https://www.ukmobilebooster.com/pages/quick_start_guide) ![4G LTE Mobile Signal Booster EE Mobile Booster ASDA Signal Booster BT Mobile Signal 250m2 Coverage UK Mobile Signal Mobile Network Enhancement higher gain yagi antenna](https://cdn.shopifycdn.net/s/files/1/0488/4129/3976/files/ProductPageHigherGainYagiAntenna.webp?v=1600640184) * * * ### 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. ![4G LTE Mobile Signal Booster EE Mobile Booster ASDA Signal Booster BT Mobile Signal 250m2 Coverage UK Mobile Signal Mobile Network Enhancement surge protector](https://cdn.shopifycdn.net/s/files/1/0488/4129/3976/files/ProductPageSurgeProtector.webp?v=1600640184) * * * ### Specification (scroll to view all) Application & Bands \[4G/LTE & Voice Calls\] (Band 20, 3) Country United Kingdom **Boost All On** EE (2G & 4G) O2 (4G) Vodafone (4G) Three (4G) Asda (2G & 4G) BT (2G & 4G) Freedom Pop (4G) Giffgaff (4G) iD Mobile (4G) Lycamobile (4G) Orange (2G & 4G) Plusnet Mobile (4G) Sky Mobile (4G) Smarty Mobile (4G) Tesco (4G) The People's Operator (2G & 4G) T-Mobile (2G & 4G) Virgin (2G & 4G) Users Supporting 25 Simultaneously Band Dual Band 20 & 3 Frequency 800MHz & 1800MHz Gain(dB) Uplink Gp≥60; Downlink Gp≥65 Up-link 832~862 MHz; 1710~1785 MHz Down-link 791~821 MHz; 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 1 x 5 Meters Indoor Cable **Warming Tips:** - Band Confirmation: This booster can boost signals on Band 20 or 3, please check the band of your devices firstly. - For iPhone: Dial \*3001#12345#\* → Press call button → Click 'Serving Cell Info' → Check 'Freq Band Indicator'. - For Android: Download 'LTE Discovery' APP → Click ‘SIGNALS’ → Check 'EARFCN'. More refer to [Quick Start Guide](https://www.ukmobilebooster.com/pages/quick_start_guide) . - External Signal Needed: The signal booster can only amplify signal but can't create signal. If there is no signal outside, it won't work, please make sure you get 1-2 bars signal outside. ### Custom your solution #### **Expandable coverage by adding indoor antenna if the outside signal is strong.** ![UK Mobile Booster Expand Cell Coverage with 3 Indoor Antennas](https://cdn.shopifycdn.net/s/files/1/0488/4129/3976/files/Expand-Cell-Coverage-with-3-Indoor-Antenna.png?v=1700361963) ### **How It Works** ![how 4G LTE Mobile Signal Booster EE Mobile Booster ASDA Signal Booster BT Mobile Signal 250m2 Coverage UK Mobile Signal Mobile Network Enhancement work for home office](https://cdn.shopifycdn.net/s/files/1/0488/4129/3976/files/ProductPageHIWhomeoffice-2.webp?v=1650634397) #### 1 **Receives signal** The powerful antenna reaches out to access a voice and 3G, 4G, and LTE data signal, and delivers it to the booster #### 2 **Boosts signal** The booster receives the signal, amplifies it, and serves as a relay between your phone and the nearest cell tower. #### 3 **Broadcasts signal** Your devices get increased cell reception, and calls and data are fed through the booster back to the network. #### **Get stronger signal** ![how 4G LTE Mobile Signal Booster EE Mobile Booster ASDA Signal Booster BT Mobile Signal 250m2 Coverage UK Mobile Signal Mobile Network Enhancement work for home office](https://cdn.shopifycdn.net/s/files/1/0488/4129/3976/files/ProductPagenormalcoverage-2.webp?v=1650634397) #### 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. ![how 4G LTE Mobile Signal Booster EE Mobile Booster ASDA Signal Booster BT Mobile Signal 250m2 Coverage UK Mobile Signal Mobile Network Enhancement work for home office](https://cdn.shopifycdn.net/s/files/1/0488/4129/3976/files/ProductPageboostedcoverage-2.webp?v=1650634397) #### 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** 1. Connect the indoor antenna to the MS port. 2. Connect the outdoor antenna to the BS Port. 3. Install the outdoor antenna and keep a minimum vertical distance of 10 meters from the indoor antenna. 4. Point the outdoor antenna to the direction where you know there is possibly a higher signal strength from the base station. 5. Power on the booster and check the signal strength. 6. 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.](https://drive.google.com/file/d/1Uch5legGJsKTzLO9PTGpgsKEnZGEq7TH/view) ![4G LTE Mobile Signal Booster EE Mobile Booster ASDA Signal Booster BT Mobile Signal 250m2 Coverage UK Mobile Signal Mobile Network Enhancement signal coverage](https://cdn.shopifycdn.net/s/files/1/0488/4129/3976/files/Coverage.jpg?v=1698191834) ### **Application Scenarios** ![4G LTE Mobile Signal Booster EE Mobile Booster ASDA Signal Booster BT Mobile Signal 250m2 Coverage UK Mobile Signal Mobile Network Enhancement home application](https://cdn.shopify.com/s/files/1/0488/4129/3976/files/application-home.png?v=1697980834) **Home** ![4G LTE Mobile Signal Booster EE Mobile Booster ASDA Signal Booster BT Mobile Signal 250m2 Coverage UK Mobile Signal Mobile Network Enhancement office application](https://cdn.shopify.com/s/files/1/0488/4129/3976/files/application-office.png?v=1697980832) **Office** ![4G LTE Mobile Signal Booster EE Mobile Booster ASDA Signal Booster BT Mobile Signal 250m2 Coverage UK Mobile Signal Mobile Network Enhancement garage application](https://cdn.shopify.com/s/files/1/0488/4129/3976/files/application-garage.png?v=1697980834) **Garage** ![4G LTE Mobile Signal Booster EE Mobile Booster ASDA Signal Booster BT Mobile Signal 250m2 Coverage UK Mobile Signal Mobile Network Enhancement metal buildings application](https://cdn.shopify.com/s/files/1/0488/4129/3976/files/application-metal-buildings.png?v=1697980834) **Metal Buildings** Tags: dual band 4G signal booster UK Band 20 Band 3, CD250 mobile booster, EE O2 Vodafone Three 4G booster 250m² UK, Band 20 800MHz Band 3 1800MHz budget dual-band repeater UK, £295 budget dual-band 4G booster medium home office cafe 25 users UK CD250, dual band 4G signal booster UK, Band 20 Band 3 800 1800MHz booster, 250m2 medium home small office cafe pub booster, EE O2 Vodafone Three 4G booster, 17dBm dual-band 4G repeater, Boost4U CD250 MBCD250gb, £295.00, Ofcom licence-exempt 4G booster UK buy dual band 4G signal booster UK medium home small office, EE 4G signal booster home UK Band 3 1800MHz 250m², O2 Vodafone 4G booster rural cottage Band 20 800MHz, Three 4G signal booster home UK O2 MOCN Band 20, small office cafe pub mobile signal booster 25 users UK, Boost4U CD250 price £295.00 MBCD250gb, budget 4G repeater 800 1800MHz plug and play UK order, 250m² cafe pub small shop 4G booster EE O2 giffgaff Tesco UK what is a dual band 4G booster Band 20 Band 3, why does O2 Vodafone 4G use Band 20 800MHz in the UK, how far apart do outdoor and indoor antennas need to be for a 250m² booster, how does a 4G signal booster work Ofcom licence exempt UK, 200m² vs 250m² signal booster coverage difference, do signal boosters need outside signal bars to work, what does 17dBm output 60 65dB gain mean on a home booster, omni vs yagi outdoor antenna for weak 4G signal UK CD250 vs CD200 dual-band 200m² booster, CD250 vs C250 single Band 20 250m² booster, dual band vs single band 4G booster which should I buy UK, CD250 vs cheap Amazon booster does it actually work, 100m² vs 200m² vs 250m² home booster coverage, CD250 vs Cel-Fi/network-provided home unit UK, budget dual-band vs premium multi-band 5G booster value UK, CD250 vs Band 7 2600MHz EE capacity booster ## Details - **Price:** 295.0 GBP - 415.0 GBP - **Vendor:** UKMobileBooster.com - **Type:** United Kingdom - **Tags:** application 4G LTE Data & Voice Calls, coverage up to 250 sq metres, frequency 800 1800MHz, gb 1p, gb asda, gb bt, gb ee, gb gb, gb orange, gb t-mobile, gb The People's Operator, gb virgin, provider 1p mobile, provider Asda, provider BT, provider EE, provider Orange, provider T-Mobile, provider The People's Operator, provider Virgin ## Variants | Variant | Price | Available | |---------|-------|-----------| | No / No / No | 295.00 GBP | In stock | | No / No / Yes | 315.00 GBP | In stock | | No / Yes / No | 345.00 GBP | In stock | | No / Yes / Yes | 365.00 GBP | In stock | | 20 M / No / No | 315.00 GBP | In stock | | 20 M / No / Yes | 335.00 GBP | In stock | | 20 M / Yes / No | 365.00 GBP | In stock | | 20 M / Yes / Yes | 385.00 GBP | In stock | | 30 M / No / No | 325.00 GBP | In stock | | 30 M / No / Yes | 345.00 GBP | In stock | | 30 M / Yes / No | 375.00 GBP | In stock | | 30 M / Yes / Yes | 395.00 GBP | In stock | | 40 M / No / No | 335.00 GBP | In stock | | 40 M / No / Yes | 355.00 GBP | In stock | | 40 M / Yes / No | 385.00 GBP | In stock | | 40 M / Yes / Yes | 405.00 GBP | In stock | | 50 M / No / No | 345.00 GBP | In stock | | 50 M / No / Yes | 365.00 GBP | In stock | | 50 M / Yes / No | 395.00 GBP | In stock | | 50 M / Yes / Yes | 415.00 GBP | In stock | ## Images - A mobile signal booster kit including various components such as antennas, cables, and a user manual, with the main unit depicted in a closed box and the external antennas in white and black. CD250 Dual Band 20 3 Mobile Signal Booster UK | 4G Calls - Man sitting on a couch using a smartphone with a blurred outdoor background UK Mobile Phone Signal Booster Improve Signal - 4G LTE Mobile Signal Booster EE Mobile Booster ASDA Signal Booster BT Mobile Signal 250m2 Coverage UK Mobile Signal Mobile Network Enhancement Mobile Signal Booster Panel Antenna - 4G LTE Mobile Signal Booster EE Mobile Booster ASDA Signal Booster BT Mobile Signal 250m2 Coverage UK Mobile Signal Mobile Network Enhancement Mobile Signal Booster Cables - 4G LTE Mobile Signal Booster EE Mobile Booster ASDA Signal Booster BT Mobile Signal 250m2 Coverage UK Mobile Signal Mobile Network Enhancement Mobile Signal Booster Outdoor and Indoor Antenna - 4G LTE Mobile Signal Booster EE Mobile Booster ASDA Signal Booster BT Mobile Signal 250m2 Coverage UK Mobile Signal Mobile Network Enhancement Mobile Signal Booster Package - 4G LTE Mobile Signal Booster EE Mobile Booster ASDA Signal Booster BT Mobile Signal 250m2 Coverage UK Mobile Signal Mobile Network Enhancement Mobile Signal Booster How Panel Antenna Works - 4G LTE Mobile Signal Booster EE Mobile Booster ASDA Signal Booster BT Mobile Signal 250m2 Coverage UK Mobile Signal Mobile Network Enhancement Mobile Signal Booster Panel Panel Antennas - 4G LTE Mobile Signal Booster EE Mobile Booster ASDA Signal Booster BT Mobile Signal 250m2 Coverage UK Mobile Signal Mobile Network Enhancement Mobile Signal Booster How it Works --- > Source: [B4U](https://www.ukmobilebooster.com/products/cd250-mobile-booster) > Updated: 2026-10-18