Answer up front: if your household runs O2 or Vodafone SIMs and needs 4G data plus boosted 2G voice calls across a 200m² two-bedroom flat, small family home or small office for up to 20 simultaneous users, the CG200 at £205.99 is the pick; it pairs Band 20 at 800 MHz data with Band 8 at 900 MHz calls, holds ≥60 dB uplink and ≥65 dB downlink gain, outputs ≥10 dBm, and ships the 10m outdoor plus 5m indoor cable pair. If you only need a single 100m² room for 10 users and can save £20.00, the CG100 at £185.99 carries the same Band 20+8 stack at ≥45/≥50 dB. If your SIMs are EE-led and you want EE data plus EE calls rather than O2/Vodafone voice, the CD200 at £205.99 swaps Band 8 for Band 3.

The £20.00 CG200-vs-CG100 gap (205.99 minus 185.99) buys an extra 100m², an extra 10 users, +15 dB of gain from ≥45/≥50 to ≥60/≥65, and the separate 5m indoor cable. The £0.00 CG200-vs-CD200 gap buys different operators rather than more machine: same 200m², same 20 users, same gain class, same price, but the CD200's Band 3 at 1800 MHz serves EE voice while the CG200's Band 8 at 900 MHz serves O2/Vodafone voice. There is no single unit that boosts EE calls and O2/Vodafone calls together, because those two call layers live on different bands this chassis family does not combine.

This page compares the three Boost4U chassis side by side rather than in a roundup: the CG200, the CG100 and the CD200. It separates the data layer on Band 20 (shared by all three) from the voice layer (Band 8 on the two CG units, Band 3 on the CD unit), sizes the area and user difference between CG200 and CG100, and gives a five-branch decision tree so the choice follows which SIMs you hold, how big the zone is, and whether budget or coverage decides.

All three 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. None carries 3G Band 1 at 2100 MHz or 5G; all run from an AC 100–240V to DC 5V UK 3-pin adapter. The rest of this page numbers every gap in pounds, dB, square metres and users before you order.

Before the tables, three rules keep the comparison honest. First, Band 20 at 800 MHz (uplink 832–862 MHz, downlink 791–821 MHz) is shared by all three and carries O2, Vodafone and Three 4G data, so data capability is not the deciding factor; the deciding factor is which voice band the chassis amplifies. Second, the CG200 and CG100 share Band 8 at 900 MHz (uplink 890–915 MHz, downlink 935–960 MHz) for O2/Vodafone 2G calls and SMS; the CD200 instead tunes Band 3 at 1800 MHz for EE 2G calls. Third, between the two CG units, only gain, area, users and the indoor cable differ, so the CG100 question is purely "do I need 200m² and 20 users today or later?"

Gain matters more than sticker price for area. The CG200's ≥60 dB uplink and ≥65 dB downlink clean a weak donor harder than the CG100's ≥45 dB and ≥50 dB; that +15 dB gap is the engineering reason coverage doubles from 100m² to 200m² and users double from 10 to 20. Output sits at ≥10 dBm behind a ≤5 dB noise figure on the CG units, and output power spreads the cleaned signal across the whip rather than creating more area on its own.

Coverage figures assume reasonable donor signal outside and 10m vertical separation between the outdoor omni and indoor whip; a weak rural donor at −97 to −105 dBm needs the optional Yagi and long cable even on the bigger chassis, and a strong donor at −70 to −90 dBm lets the CG200 add a second indoor antenna via splitter, up to two total. The tables below compare specs, price gaps and day-one versus five-year cost before the decision tree.

Read the voice rows before the price rows: both CG units boost O2/Vodafone calls, only CD200 boosts EE calls, and all three boost O2/Vodafone/Three 4G data on the shared Band 20.

The £20.00 CG100 saving is real but buys a smaller footprint, not a different network; the £0.00 CD200 tie changes only the voice operator. Neither gap buys more data speed, because Band 20 data is identical across all three chassis.

The CG200 and CG100 tune the identical two bands: Band 20 at 800 MHz for O2, Vodafone and Three 4G data, and Band 8 at 900 MHz for O2/Vodafone 2G voice calls and SMS. If both sit in a single room, they look the same because the shared donor and Band 20 data and Band 8 voice work on either chassis. The difference appears when the zone grows: the CG200 raises gain from ≥45/≥50 dB to ≥60/≥65 dB, which spreads the cleaned signal across 200m² for 20 users rather than 100m² for 10 users.

The +£20.00 line item by line item

For £20.00 (205.99 minus 185.99), the CG200 adds: +100m² of rated indoor area (200 versus 100); +10 simultaneous users (20 versus 10); +15 dB of gain split as +15 dB uplink (≥60 versus ≥45) and +15 dB downlink (≥65 versus ≥50); and a separate 5m indoor coaxial cable on top of the shared 10m outdoor low-loss coax. The output ≥10 dBm and ≤5 dB noise figure are class-matched, and the 5 dBi omni outdoor aerial and 3 dBi whip indoor antenna are the same family.

Where the CG100 still wins

The CG100 at £185.99 wins on entry price by £20.00 and is the honest choice for a single-bedroom flat, a bedsit, one home office room, or a static caravan pitch where the whip only serves one zone. In that footprint the extra 15 dB and 100m² are wasted capacity, and the lower price plus the same Band 20+8 data-and-calls path makes the CG100 the value pick. The CG100 also keeps the smaller 100m² rating that matches a studio rather than over-promising coverage the chassis cannot hold.

Where the CG200 becomes unavoidable

Once the layout is a two-bedroom flat, a living room plus kitchen plus back room, or a small shop and office floor used by staff and customers, the CG100's 10-user and 100m² rating thins at the far wall. The CG200's higher gain and 20-user headroom keep data and calls connected across the full footprint, and the second indoor antenna option (strong donor, up to 2 total) extends a second zone without buying a new box. Buying CG100 now and CG200 later costs 185.99 plus 205.99 rather than choosing the CG200 once for £205.99.

The CG200 and CD200 are a £0.00 tie on upfront price, area (200m²), users (20) and the ≥60/≥65 dB gain class; even the 10m outdoor plus 5m indoor cable stack matches. The whole difference is the voice band the chassis amplifies, because both share Band 20 for O2/Vodafone/Three 4G data.

CG200 Band 8: O2 and Vodafone calls

The CG200 tunes Band 8 at 900 MHz (uplink 890–915 MHz, downlink 935–960 MHz). On O2 and Vodafone SIMs this boosts 2G voice calls and SMS indoors, and 900 MHz also reaches deeper through masonry than higher bands. MVNOs on the O2 network (giffgaff, Sky Mobile, Talkmobile, Lycamobile, Tesco) and on Vodafone (Lebara 2G, TalkTalk 2G) ride this same call layer. EE receives Band 20 4G data only; the CG200 does not tune EE's Band 3 voice.

CD200 Band 3: EE data and calls

The CD200 tunes Band 3 at 1800 MHz instead, which carries EE 4G data and EE 2G voice. An EE-led home gets boosted EE calls that the CG200 cannot provide; in return, O2 and Vodafone SIMs receive Band 20 data only, with the call channel left native on 2G rather than boosted. The CD200 cannot add Band 8 later, and the CG200 cannot add Band 3 later; these are fixed voice layers, not switchable modules.

The £0.00 tie decides by SIM, not by spec

Because price, area, users and gain are identical, the CG200-versus-CD200 choice is a pure operator question: O2/Vodafone-led household with calls = CG200; EE-led household with calls = CD200; mixed where EE voice and O2/Vodafone voice both matter = no single chassis solves both, and a second band-specific unit or a larger multi-band system is required rather than forcing one box.

Walk the branches top to bottom and stop at the first yes.

Branch 1 — Are your main SIMs O2 or Vodafone (incl. giffgaff, Sky, Talkmobile, Lycamobile, Tesco, Lebara, TalkTalk) and do calls drop indoors?

Yes on both: the Band 8 call layer matters, so stay inside the CG family. Move to Branch 2 for size; do not pick the CD200, which leaves these calls native.

Branch 2 — Is the boosted zone 100m² or smaller (one room, bedsit, single office) and active devices 10 or fewer?

Yes: CG100 at £185.99, Band 20+8, single zone, save £20.00. No (two-bedroom flat, living-plus-kitchen, small office, 11–20 active devices, or growth planned within 2 years): CG200 at £205.99, 200m², 20 users, ≥60/≥65 dB.

Branch 3 — Are the main SIMs EE-led and does EE voice drop indoors while O2/Vodafone appear only as data?

Yes: CD200 at £205.99, Band 20+3, EE data and calls across 200m² for 20 users. Do not reach for the CG200 because it never boosts EE Band 3 voice.

Branch 4 — Do you need both EE boosted calls AND O2/Vodafone boosted calls in one home?

Yes: none of the three chassis covers both voice layers; plan a band-specific second unit or a larger multi-band system rather than overloading a single box. No: return to Branch 1 or 3.

Branch 5 — Is the site a whole detached house, a multi-floor spread, 3G Band 1, or 5G?

Yes: a single 200m² chassis is undersized or band-wrong; choose a larger or multi-band system. No and the zone fits 200m²: return to Branch 1, 2 or 3 and order the matched unit.

Day one, CG200 and CD200 tie at £205.99 and CG100 sits at £185.99. The five-year total separates them when a second purchase appears.

The CG100 buyer who expands later pays 185.99 plus a 200m² chassis before the second aerial and cable run; the CD200 buyer who later adds an O2/Vodafone call layer pays a Band 8 unit on top of the 205.99 already spent. Only the correctly matched single CG200 or CD200 closes the job day one at £205.99. The £20.00 CG100 saving evaporates when growth forces the second box.

The CG200 box at £205.99 holds the ~450 g amplifier (170×110×30 mm, 3.0 kg shipping), the 5 dBi omni outdoor aerial, the 3 dBi whip indoor antenna, the 10m outdoor low-loss coax, the separate 5m indoor coax, and the AC 100–240V 50/60Hz to DC 5V UK 3-pin adapter. Optional: 20m (+£20), 30m (+£30), 40m (+£40), 50m (+£50) cable; external/Yagi aerial (+£30); protector (+£20); max optional combo £325.99. The CG100 box carries the 10m outdoor cable alone; the CD200 box matches the CG200 cable stack for its EE job.

Basic setup takes 10 to 15 minutes without tools: fix the omni outside with a clear mast view, keep the indoor whip at least 10 m vertical below, run the outdoor and indoor coax, power from the UK 3-pin adapter, and read steady green before testing. Strong donor at −70 to −90 dBm permits a second indoor antenna via splitter; weak donor at −97 to −105 dBm needs the Yagi and long cable first.

All three carry UKCA, CE and RoHS, are Ofcom licence-exempt, ship free within the UK (handling 1–2 days, transit 10–15 days), and carry a 365-day mail return window. The £205.99 CG200 price is valid to 2027-10-18, InStock NewCondition, and ships to GB, DE, FR, IT, ES, NL, BE, AT, SE, DK, FI, IE, PT, PL and CZ; the CG100 at £185.99 and CD200 at £205.99 follow the same shipping and return terms.

O2/Vodafone household, 200m², 20 devices, calls must hold: CG200 at £205.99, Band 20+8, the only 200m² box that boosts O2/Vodafone calls.

O2/Vodafone household, one 100m² room, 10 devices, save £20: CG100 at £185.99, same bands, smaller footprint.

EE-led household, 200m², EE calls matter: CD200 at £205.99, Band 20+3, accept O2/Vodafone data-only.

Quick verdict: pay £20 more for CG200 only when the zone really reaches 200m² and 20 users; at the £0.00 tie, CG200 serves O2/Vodafone calls and CD200 serves EE calls, so match the voice band to your SIM rather than chasing the bigger spec sheet.