Verdict up front: the CW250 at £295.00 is the #1 in this 3G+4G 250m² roundup and the flagship chassis that pairs Band 20 at 800 MHz for EE, O2, Vodafone and Three 4G LTE data with Band 1 at 2100 MHz for 3G UMTS data, voice and SMS across all four UK networks from one device in a 250m² (2,691 ft²) three-bedroom home, large flat, small office or cafe for up to 25 simultaneous users. It holds ≥60 dB uplink and ≥65 dB downlink gain, outputs ≥17 dBm — a +7 dBm step over the CW200's ≥10 dBm, roughly five times the transmitted power — behind a ≤5 dB noise figure, ships the 5 dBi omni outdoor aerial, the 3 dBi whip indoor antenna, a 10m outdoor plus 5m indoor low-loss coax and the AC 100–240V to DC 5V UK plug, supports up to 3 indoor antennas on a 3-way splitter, and offers the high-gain Yagi, longer external cable and 18KA surge protector as paid upgrades.

The CW200 at £205.99 keeps the same Band 20+1 logic but scales to 200m², 20 users and ≥10 dBm output with up to 2 indoor antennas; the CW250 adds £89.01 for +50m² (250m²), +5 users (25), the +7 dBm output step and a third indoor antenna zone. The CG250 at the same £295.00 pairs Band 20 data with Band 8 at 900 MHz for O2/Vodafone 2G calls, leaving EE and Three without a boosted voice fallback; the CD250 at the same £295.00 pairs Band 20 data with Band 3 at 1800 MHz for EE data and EE 2G, leaving O2/Vodafone voice data-only on the call layer. The CW250 takes the universal path: instead of one legacy 2G call band, it amplifies Band 1 at 2100 MHz, the 3G UMTS layer every UK network used before VoLTE, so EE, O2, Vodafone and Three all keep a call and data fallback where 4G alone weakens.

Across a Devon cottage, a Yorkshire home, a Welsh valley, a Scotland farm, a Cornwall home office and a rural village, the CW250 lifted data from one bar to five and kept calls connected where 4G alone faded, a result a data-only Band 20 box cannot reproduce because it carries no fallback call layer. The CG250 kept O2/Vodafone 2G calls but left EE calling native; the CD250 kept EE data but left O2/Vodafone calling native; the CW250 keeps a 3G fallback for all four networks rather than betting on one legacy operator band, and its higher ≥17 dBm output spreads that universal Band 1 signal across a third room zone the 2-antenna CW200 cannot reach cleanly.

All Boost4U units here are UKCA and CE certified, Ofcom licence-exempt, ship free within the UK on 1 to 2 day handling plus 10 to 15 day transit, and carry a 365-day mail return window. The CW250 installs in 10 to 15 minutes without tools, runs from the AC 100–240V 50/60Hz to DC 5V UK Type plug, operates between −10°C and +55°C, and packs to a 3.0 kg shipping weight with the 450g booster itself measuring 170×110×30mm. The difference between these models is which bands each chassis was tuned to amplify, how large an area and how many devices they serve, how strongly the cleaned signal reaches indoor zones, and what £295.00 actually buys in a 250m² home or small office.

This roundup compares the Boost4U CW250 at £295.00, the Boost4U CW200 at £205.99, the Boost4U CG250 at £295.00, the Boost4U CD250 at £295.00, a cheap generic single-band box around £120 estimated, and an imported home booster around £250 estimated. We judged each unit on eight fixed questions: which frequency bands it amplifies, which operators receive 4G data versus a call fallback, how much gain and output it delivers, what indoor area and how many simultaneous users it supports, how many indoor antenna zones it can feed, which antennas and cables ship, how the CW250 sits between the smaller CW200 and the legacy-voice CG250/CD250, and whether a Yagi, longer cable and surge protector can be added.

Frequency bands decide networks before price. Band 20 at 800 MHz (uplink 832 to 862 MHz, downlink 791 to 821 MHz) carries EE, O2, Vodafone and Three 4G LTE data in rural coverage. Band 1 at 2100 MHz (uplink 1930 to 1990 MHz, downlink 2110 to 2180 MHz) carries 3G UMTS data, voice and SMS for EE, O2, Vodafone and Three; it is the universal pre-VoLTE layer, so a call on any network can fall back to 3G rather than dropping entirely. Band 8 at 900 MHz carries only O2/Vodafone 2G; Band 3 at 1800 MHz carries EE 4G and EE 2G. A chassis tuned to one band cannot manufacture the others, no matter how many bars it claims.

Gain measured ≥60 dB uplink / ≥65 dB downlink cleans the weak incoming donor to a flagship level matched across the CW250 and CW200; the decisive output difference is ≥17 dBm on the CW250 against ≥10 dBm on the CW200, a +7 dBm step that roughly multiplies transmitted power by five and lets the cleaned signal reach a third indoor antenna zone across masonry. The rated 250m² (2,691 ft²) assumes reasonable donor signal outside and sensible antenna separation; it covers a three-bedroom house, large flat, family home, small office, cafe or shop, not a whole multi-floor mansion. The 25 simultaneous-user rating counts family phones, tablets, home-office laptops and a small crew attaching to one boosted cell before the serving network scheduler congests.

Mounting and upgrades: the CW250 standard kit ships the 5 dBi omni outdoor aerial, the 3 dBi whip indoor antenna, the 10m outdoor low-loss coax plus the 5m indoor run, the UK power adapter, mounting bracket and quick start guide; the high-gain Yagi directional aerial, 20/30/40/50m external cable and 18KA lightning surge protector are paid variants. On a strong −70 to −90 dBm donor the product note reads "Expandable coverage by adding indoor antenna, splitter, cable if the outside signal is strong," supporting up to 3 indoor antennas through a 3-way splitter and extra cable; a weak −97 to −105 dBm donor uses the optional Yagi aimed at the nearest mast.

We treated the CW250, CG250 and CD250 at £295.00 and the CW200 at £205.99 as fixed shop prices, the generic box around £120 and imported kit around £250 as estimates beside or below the dual-band sticker without a UKCA Band 20+1 mark. Every unit below is judged on honest strengths and weaknesses; we do not recommend buying two single-band boosters when one dual-band £295.00 unit does the same job more cleanly.

The table below lays out the complete technical picture across all five models. The Boost4U units are UKCA and CE certified and Ofcom licence-exempt; the generic and imported kits are not UKCA-tuned for the Band 20+1 stack. The decisive rows are frequency bands, 3G all-network fallback, output power step, 250m² coverage, 25 users and the 3-indoor-antenna zone.

The single most important row is the 3G all-network fallback: only the CW250 and CW200 amplify Band 1 so EE, O2, Vodafone and Three all keep a call and data fallback, and only the CW250 pairs that universal Band 1 with 250m², 25 users, the ≥17 dBm output step and 3 indoor antenna zones; the second deciding row is output power, where the +7 dBm step over CW200 is what feeds the third room rather than chasing a legacy 2G band.

The shop prices are fixed as listed. The CW250, CG250 and CD250 all sit at £295.00; the CW200 sits at £205.99, exactly £89.01 below; the generic box around £120 and imported kit around £250 sit below or above the dual-band sticker without a UKCA Band 20+1 mark.

The £89.01 between CW200 and CW250 buys +50m² coverage (250 against 200), +5 users (25 against 20), the +7 dBm output step (≥17 against ≥10, roughly five times power) and a third indoor antenna zone; it does not buy a different band plan, because both carry Band 20+1. The £0.00 tie between CW250, CG250 and CD250 buys a different fallback band rather than more area, users or output. The CG250 buyer later adds Band 1 for EE/Three fallback, and the CD250 buyer later adds Band 1 for O2/Vodafone fallback, paying a second unit on top of the same £295.00 already spent. The single CW250 at £295.00 wins the mixed-network 250m² home, small office or cafe that needs a universal 3G fallback and a third room zone rather than betting on one legacy operator's 2G band.

The CW250 is the flagship Band 20+1 member of the Boost4U dual-band family. At £295.00 it pairs Band 20 at 800 MHz for EE, O2, Vodafone and Three 4G LTE data with Band 1 at 2100 MHz for 3G UMTS data, voice and SMS across all four networks. Its uplink gain reaches ≥60 dB and downlink gain ≥65 dB, matching the CW200, while its max output power reaches ≥17 dBm — a +7 dBm step over the CW200's ≥10 dBm, roughly five times the transmitted power — behind a ≤5 dB noise figure; the 3G layer is the universal pre-VoLTE fallback that every UK network operated before HD voice, so a call on EE, O2, Vodafone or Three can land on 3G rather than dropping entirely when 4G fades.

The rated coverage of up to 250m² (2,691 ft²) targets a three-bedroom house or large flat, a family home with mixed-network devices, a rural weak-signal large home or holiday cottage, a small office, cafe or shop, and a large garage or workshop with metal walls. The 25 simultaneous-user rating counts family phones, tablets, home-office laptops and a small crew attaching to one boosted cell before the serving network scheduler congests. The full kit ships the 5 dBi omni outdoor aerial, the 3 dBi whip indoor antenna, the 10m outdoor low-loss coax plus the 5m indoor run, the UK power adapter, a mounting bracket and a quick start guide; upgrades are the high-gain Yagi directional aerial, 20/30/40/50m external cable, and the 18KA lightning surge protector, available on the paid variant options.

On the service list, the CW250 delivers 3G and 4G for EE, O2, Vodafone, Three, Asda, BT, FreedomPop, giffgaff, iD Mobile, Lycamobile, Talkmobile, Orange, Plusnet, Sky, Smarty, Tesco, The People's Operator, T-Mobile and Virgin; Lebara and TalkTalk receive 3G only. It carries no 2G voice on Band 8 or Band 3, and no 5G; VoLTE calls work where the network already supports them, and Band 1 keeps a 3G fallback where VoLTE does not. On a strong −70 to −90 dBm donor, the note "Expandable coverage by adding indoor antenna, splitter, cable if the outside signal is strong" supports up to 3 indoor antennas through a 3-way splitter and extra cable — one more zone than the CW200's 2-way setup; a weak −97 to −105 dBm donor uses the optional Yagi aimed at the nearest mast.

The CW200 shares the CW250's Band 20+1 band plan and universal 3G fallback but sits one tier below on output, area and antenna zones. At £205.99 it reaches 200m² (2,153 ft²) for 20 users at ≥60/≥65 dB gain, but outputs only ≥10 dBm and supports up to 2 indoor antennas on a 2-way splitter, with the 10m outdoor plus 5m indoor cable stack. It is the correct unit for a two-bedroom flat or small home where 250m², 25 users, a third room zone and the higher output are never reached.

The £89.01 gap between CW200 and CW250 is a scale and power step, not a network change: both amplify the same Band 20 data and Band 1 3G, so a buyer who only needs two rooms can save £89.01 on the CW200, while a buyer covering three bedrooms, a living room and a home office needs the CW250's larger area, more users, higher output and third antenna zone to hold one universal fallback.

The CG250 matches the CW250 on price, area, users and gain but swaps the fallback band and lower output. At £295.00 it tunes Band 20 at 800 MHz for EE, O2, Vodafone and Three 4G data and Band 8 at 900 MHz for O2/Vodafone 2G voice calls and SMS. It also reaches 250m² for 25 users at the ≥60/≥65 dB gain class, but outputs ≥10 dBm rather than the CW250's ≥17 dBm, so it competes on size, price and legacy O2/Vodafone calling, not on universal fallback or third-room power.

The critical difference is coverage of the call layer: on O2 and Vodafone, the CG250 boosts 2G voice on Band 8, but on EE and Three it provides Band 20 data only with no boosted call fallback, because EE 2G rides Band 3 and the CG250 does not tune Band 1 either. The CG250 is the right box when the household SIMs are O2/Vodafone-led and EE/Three calling never appears; it cannot give an EE or Three phone a universal 3G fallback.

The CD250 also matches on price, area, users and gain but tunes Band 20 data with Band 3 at 1800 MHz for EE 4G data and EE 2G voice. At £295.00 it reaches 250m² for 25 users at ≥60/≥65 dB, with the ≥10 dBm output class. On O2 and Vodafone it provides Band 20 data only, with no boosted call fallback and no Band 1 3G layer; Three likewise receives data only.

The CD250 is the right box when the household SIMs are EE-led and O2/Vodafone appear only as data. It cannot serve an O2/Vodafone caller's legacy call and cannot give every network a 3G fallback, which is the CW250's distinctive Band 1 role.

The cheap generic single-band box around £120 estimated amplifies one Band 20 data channel on a marketplace chassis with vendor-rated, often unmeasured gain, no UKCA mark for the Band 20+1 stack, and a 10m cable and UK plug of uncertain origin. It carries no Band 1 3G fallback, so calls are never boosted regardless of price; its 10- to 25-user and 250m² claims are typically measured in open space, not across UK masonry, and its output is a vendor figure rather than a measured ≥17 dBm.

The imported home booster around £250 estimated is a recognised US brand but is tuned to North-American band planning and 120V supply; it is not UKCA-licence-exempt for Band 20+1 as sold for the UK, and import duty, VAT and warranty gaps leave it near the £295.00 sticker without delivering the universal EE/O2/Vodafone/Three 3G fallback or the 3-way antenna expansion.

The matrix below separates 4G data, the Band 1 3G fallback and legacy 2G voice for every operator on the listed SIMs, because a booster that lists "4G" often leaves the call path un-amplified.

The CW250 and CW200 are the only units that keep a Band 1 3G fallback for all four direct networks; the CG250 owns the O2/Vodafone 2G row and the CD250 owns the EE 2G row, but neither covers every operator's call path, and neither pairs that legacy band with a universal 3G layer or the CW250's third antenna zone.

The CW250 product page carries 10 submitted reviews averaging ratingValue 4.7 (seven five-star and three four-star, reviewCount 10). The quotes below are reproduced verbatim from the product page and show where the booster worked and where the limits appeared.

The four-star notes are honest boundary signals: David W. needed the long-cable upgrade to reach a remote roof, Lisa P. found two rooms enough and a whole house needed more, and Andrew G. noted 12-day transit despite solid performance. None reports a failed data or 3G-fallback channel on the intended Band 20+1 SIMs; Lebara and TalkTalk ride Band 1 3G rather than 4G.

Day one, the CW250, CG250 and CD250 all sit at £295.00, the CW200 sits at £205.99, the generic around £120 and imported around £250 sit below or above. The five-year row decides the total.

The growth paths both exceed the single CW250: the CW200 buyer who later fills three bedrooms must step up a tier rather than add a second antenna zone, and the CG250 or CD250 buyer later adds a Band 1 unit for the missing network on top of the same £295.00 already spent. The single CW250 at £295.00 wins the mixed-network 250m² home, small office or cafe on both day-one and five-year cost; the CW200 wins only when two rooms and 20 users are the whole job, and CG250/CD250 win only when one operator's legacy 2G is the whole story.

The CW250 base at £295.00 includes the booster (450g, 170×110×30mm), the 5 dBi omni outdoor aerial, the 3 dBi whip indoor antenna, the UK power adapter, the 10m outdoor low-loss coax, the 5m indoor coax, a mounting bracket and a quick start guide; three paid variants exist: the high-gain Yagi directional aerial, 20/30/40/50m external cable, and the 18KA lightning surge protector. On a strong −70 to −90 dBm donor, a 3-way splitter and extra coax feed up to 3 indoor antennas for adjacent rooms; a weak −97 to −105 dBm donor uses the optional Yagi aimed at the nearest mast.

Basic setup takes 10 to 15 minutes: mount the omni with a clear mast view, keep the whip a sensible distance inside, run the 10m outdoor and 5m indoor coax, power from the UK plug, and read steady green before testing. The verbatim expansion note reads "Expandable coverage by adding indoor antenna, splitter, cable if the outside signal is strong."

All units carry UKCA, CE and RoHS marks, are Ofcom licence-exempt, ship free within the UK on 1 to 2 day handling plus 10 to 15 day transit, and carry a 365-day mail return window. The £295.00 CW250 price is valid to 2027-10-21, is listed InStock as NewCondition, and ships to GB, DE, FR, IT, ES, NL, BE, AT, SE, DK, FI, IE, PT, PL and CZ.

For a mixed-network three-bedroom house, large flat, small office or cafe where EE, O2, Vodafone and Three all need 4G data plus a universal 3G fallback across 250m² for 25 users with ≥17 dBm output and 3 indoor antenna zones, the CW250 at £295.00 is the answer, pairing Band 20 data with Band 1 3G in one Ofcom-legal UKCA box, no second purchase planned.

For a two-bedroom flat or small home at 200m² for 20 users with 2 antenna zones, the CW200 at £205.99 keeps the same universal Band 20+1 fallback at ≥10 dBm and saves £89.01.

For an O2/Vodafone-led household needing 2G calls rather than universal 3G at 250m², the CG250 at £295.00 covers that narrower job at the same area and gain, provided EE and Three calling never appears.

For an EE-led household needing EE 2G calls rather than universal 3G at 250m², the CD250 at £295.00 covers that narrower job at the same spec, provided O2/Vodafone calling never appears.

For 5G, a whole multi-floor mansion, or an imported North-American kit: none of the stretch matches UK Band 20+1 universal fallback, so choose the matched UKCA unit rather than overloading a US-tuned box.

The flagship take: at £295.00 the CG250 serves only O2/Vodafone 2G and the CD250 serves only EE 2G, while the CW250 keeps a Band 1 3G fallback for EE, O2, Vodafone and Three across 250m² for 25 users with ≥17 dBm and three antenna zones; below it the CW200 at £205.99 keeps the same universal band on a 200m²/20-user scale, so pick the smaller unit for two rooms and the CW250 for the three-bedroom home or small office that needs the third zone.