Answer up front: if your car, van, HGV, motorhome, caravan or taxi runs O2 or Vodafone SIMs and needs 4G data plus boosted 2G voice calls on rural roads or campsites, the CVCG at £259.99 is the pick; it pairs Band 20 at 800 MHz data with Band 8 at 900 MHz calls, cleans at 45 dB uplink and 50 dB downlink, outputs ≥10 dBm per band behind a ≤5 dB noise figure, runs Automatic Gain Control, and mounts the magnetic 5 dBi omni in seconds for a 100m² cabin and up to 15 users. If your SIMs are EE-led and you want EE data plus EE calls rather than O2/Vodafone voice, the CVCD at £259.99 swaps Band 8 for Band 3 at the same gain, output, AGC, mount and cabin capacity. If you only need stronger sat-nav and music on a £139.99 budget with no boosted-call expectation, the CVC carries Band 20 data alone.

The £0.00 CVCG-versus-CVCD gap buys different operators rather than more machine: same £259.99, same 100m², same 15 users, same 45/50 dB gain, same ≥10 dBm output, same AGC, same magnetic mount and 5m coax, but the CVCD's Band 3 at 1800 MHz serves EE voice while the CVCG's Band 8 at 900 MHz serves O2/Vodafone voice. The £120.00 CVC saving (259.99 minus 139.99) buys a single Band 20 data channel across a roughly 50m² interior for about 10 users with no voice layer at all. No single unit 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 vehicle chassis side by side rather than in a roundup: the CVCG, the CVCD and the CVC. It separates the data layer on Band 20 (shared by all three) from the voice layer (Band 8 on the CVCG, Band 3 on the CVCD, none on the CVC), sizes the cabin area, user count and mount, and gives a five-branch decision tree so the choice follows which SIMs you hold, how the vehicle is used, whether calls matter, 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 a 5V DC vehicle supply (the CVCG also supports an optional 240V AC adapter for static caravan mains hookup and a power bank). The rest of this page numbers every gap in pounds, bands, 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 CVCG adds Band 8 at 900 MHz (uplink 890–915 MHz, downlink 935–960 MHz) for O2/Vodafone 2G calls and SMS; the CVCD instead tunes Band 3 at 1800 MHz for EE 2G calls; the CVC tunes neither voice band. Third, between the CVCG and CVCD the gain, output, AGC, users and mount match, so the CVCD question is purely "do my SIMs need EE voice instead of O2/Vodafone voice?"; the CVC question is purely "do I need a voice layer at all?"

Cabin coverage scales less dramatically than on a home booster because one whip fills the vehicle rather than floors: the CVCG and CVCD rate 100m² interior for 15 users, the CVC roughly 50m² for about 10 users. The AGC feature on the dual-band units adjusts to the changing donor as the vehicle moves; the magnetic 5 dBi omni clips to the roof in seconds, and the optional fishtail directional aerial (3 magnets, 3m coax, £287.56 combo on the CVCG path) serves a weak rural or campsite donor.

Coverage figures assume reasonable donor signal outside and the roof aerial mounted on the highest clear metal point; a weak rural pitch at the far edge uses the fishtail aimed at the nearest mast rather than the omni's all-round pickup. 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: the CVCG boosts O2/Vodafone calls, the CVCD boosts EE calls, the CVC boosts no calls, and all three boost O2/Vodafone/Three 4G data on the shared Band 20; then read cabin area and users, where CVCG and CVCD share 100m² and 15 users, and CVC sits at ~50m² and ~10 users.

The £0.00 CVCD tie changes only the voice operator; the £120.00 CVC saving buys no voice layer and a smaller cabin, not a different data speed, because Band 20 data is identical across all three chassis.

The CVCG and CVCD are a £0.00 tie on upfront price, cabin area (100m²), users (15), gain (45/50 dB), output power (≥10 dBm per band), AGC, magnetic mount and the 5m coax; even the compact cigarette-box chassis and 5V DC vehicle supply match. The whole difference is the voice band the chassis amplifies, because both share Band 20 for O2/Vodafone/Three 4G data.

CVCG Band 8: O2 and Vodafone calls

The CVCG 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 inside the cabin, and 900 MHz reaches deeper through bodywork and headlining 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 CVCG does not tune EE's Band 3 voice.

CVCD Band 3: EE data and calls

The CVCD tunes Band 3 at 1800 MHz instead, which carries EE 4G data and EE 2G voice. An EE-led driver gets boosted EE calls that the CVCG 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 CVCD cannot add Band 8 later, and the CVCG 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, cabin, users, gain, output, AGC and mount are identical, the CVCG-versus-CVCD choice is a pure operator question: O2/Vodafone-led driver or fleet with calls = CVCG; EE-led driver or fleet with calls = CVCD; mixed where EE voice and O2/Vodafone voice both matter = no single chassis solves both, and a band-specific second unit is required rather than forcing one box.

The CVC at £139.99 amplifies only Band 20 at 800 MHz; it carries O2, Vodafone and Three 4G data across a roughly 50m² interior for about 10 users at the same gain class and ≥10 dBm output, but it has no Band 8 voice channel and no Band 3 EE voice. The CVCG at £259.99 adds £120.00 for the entire calling capability, a wider 100m² cabin, 15 users, AGC and the fishtail upgrade path.

What the £120.00 line item buys

For £120.00 (259.99 minus 139.99), the CVCG adds: Band 8 at 900 MHz O2/Vodafone 2G calls and SMS; 50→100m² rated interior; ~10→15 simultaneous users; AGC on a moving vehicle; and the optional fishtail aerial combo for weak donors. Band 20 data, gain class, output, magnetic mount and 5m coax are matched.

Where the CVC still wins

The CVC at £139.99 wins on entry price by £120.00 and is the honest choice for a data-only driver who needs stronger sat-nav, music and traffic apps and holds no boosted-call expectation in a small car or single cab. There the voice layer and the wider cabin are unused capacity, and the lower price makes the CVC the value pick for data alone.

Where the CVCG becomes unavoidable

Once the driver or fleet depends on taking O2/Vodafone calls on the road — taxi and private hire, delivery runs, field sales, a caravaner who must phone the site office, an HGV driver on dispatch calls — the CVC's data-only channel leaves those calls native and thin at the cabin edge. The CVCG's Band 8 layer keeps them boosted through metal and headlining, and AGC holds the gain as the donor changes. Buying the CVC now and the CVCG later costs 139.99 plus 259.99 rather than choosing the CVCG once for a calling driver.

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

Branch 1 — Are your main driver or fleet SIMs O2 or Vodafone (incl. giffgaff, Sky, Talkmobile, Lycamobile, Tesco, Lebara, TalkTalk) and do calls matter on the road?

Yes on both: the Band 8 call layer matters, so stay inside the dual-band CVCG path. Move to Branch 2 for cabin size and budget; do not pick the CVCD, which leaves these calls native.

Branch 2 — Do you only need stronger sat-nav and music, accept native calls, and drive a small car or single cab under ~10 users?

Yes: CVC at £139.99, Band 20 data only, ~50m², ~10 users, save £120.00. No (taxi, private hire, delivery, field sales, caravan calls, HGV dispatch, crew or passenger devices up to 15, or a wider motorhome/caravan interior): CVCG at £259.99, Band 20+8, 100m², 15 users, AGC, magnetic mount, optional fishtail.

Branch 3 — Are the main driver or fleet SIMs EE-led and does EE voice drop on the road while O2/Vodafone appear only as data?

Yes: CVCD at £259.99, Band 20+3, EE data and calls across 100m² for 15 users with AGC and magnetic mount. Do not reach for the CVCG because it never boosts EE Band 3 voice.

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

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

Branch 5 — Do you need 3G Band 1, 5G, or a static house-wide system beyond the cabin?

Yes: a vehicle booster is the wrong form factor; choose a larger static or multi-band commercial system. No and the vehicle fits 100m²: return to Branch 1, 2 or 3 and order the matched unit.

Day one, CVCG and CVCD tie at £259.99 and CVC sits at £139.99. The five-year total separates them when a second purchase appears.

The CVC buyer who later needs calling pays 139.99 plus a dual-band chassis before mounting, cable and install; the CVCD buyer who later adds an O2/Vodafone call layer pays a Band 8 unit on top of the 259.99 already spent. Only the correctly matched single CVCG or CVCD closes the job day one at £259.99. The £120.00 CVC saving evaporates when calling forces the second box.

The CVCG box at £259.99 holds the ~380 g booster (150×100×28 mm; 1.5 kg shipping), the magnetic-mount 5 dBi omni roof aerial, the 3 dBi whip indoor antenna, the 5m low-loss coax, and the 5V DC cigarette-lighter adapter; the paid external-aerial variant is the fishtail directional aerial (3 magnets, 3m coax, £287.56 combo) for a weak donor, not an included Yagi. An optional 240V AC adapter powers a static caravan from mains hookup, and a mobile power bank runs the unit away from a socket. The CVCD box carries the same cable stack and mount for its EE job; the CVC box carries the Band 20 data-only stack at £139.99.

Basic setup takes under 15 minutes without tools: fix the magnetic omni to the roof's highest clear point (or aim the fishtail at the nearest mast on a weak rural or campsite donor), route the 5m coax through a door seal or window, clip the 3 dBi whip inside, plug into the cigarette-lighter socket, and read steady green before testing. AGC holds sensible gain as the donor changes; unplug when not in use, and the low-radiation design keeps handset emissions lower near the driver.

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 £259.99 CVCG price is valid to 2027-10-19, InStock NewCondition, and ships to GB, DE, FR, IT, ES, NL, BE, AT, SE, DK, FI, IE, PT, PL and CZ; the CVCD at £259.99 and CVC at £139.99 follow the same shipping and return terms.

O2/Vodafone driver or fleet, calls matter on the road, taxi/delivery/field sales/caravan/HGV dispatch, 100m² cabin up to 15 devices: CVCG at £259.99, Band 20+8, AGC, magnetic mount, the only vehicle box that boosts O2/Vodafone calls.

EE-led driver or fleet, EE calls matter: CVCD at £259.99, Band 20+3, accept O2/Vodafone data-only.

Data-only driver, sat-nav and music, save £120.00: CVC at £139.99, Band 20, native calls.

Quick verdict: at the £0.00 CVCG/CVCD tie, CVCG serves O2/Vodafone calls and CVCD serves EE calls, so match the voice band to your SIM; pay the £120.00 over CVC only when calling matters, and keep the data-only CVC for sat-nav and music rather than expecting it to hold a phone call on the road.