# Calls - Car Vehicle Caravan (O2/Vodafone/giffgaff/Sky Mobile) Mobile Signal Booster

# Boost4U CVG — Car Mobile Signal Booster for Calls UK

**The Boost4U CVG (£109.99) is a Band 8 (900 MHz) in-vehicle mobile signal booster that amplifies 2G GSM voice calls and SMS for O2, Vodafone, giffgaff, Lebara, Lycamobile, Sky Mobile, TalkMobile, TalkTalk and Tesco Mobile networks inside cars, vans, trucks, motorhomes and boats, with 45 dB uplink / 40 dB downlink gain, 10 dBm output, support for 10 simultaneous users, a magnetic-mount external aerial, an interior antenna and a 5V DC car power adapter, providing reliable hands-free calls and text messaging while driving across rural and urban UK roads.**

Designed specifically for UK drivers who suffer from dropped calls, "No Service" errors and unsent texts while on the move, the CVG captures weak 900 MHz Band 8 signals through a roof-mounted external aerial, amplifies them inside the vehicle cabin, and rebroadcasts a strong signal to all passengers' phones. Unlike home boosters, the CVG is compact, 12V/5V powered, and engineered for the unique signal challenges of moving vehicles — metal bodywork, tinted windows, rural dead zones and motorway blackspots.

##### **Compact Design**

  

The Calls - Car Vehicle Caravan Mobile Signal Booster boasts a sleek, compact design, similar to a cigarette box. This makes it easy to carry and perfect for various small spaces, ensuring you can enjoy better signal coverage wherever you go.  
![Car Vehicle Mobile Phone Signal Booster Improve Signal Feature](https://cdn.shopify.com/s/files/1/0488/4129/3976/files/Car-Signal-Booster-Feature1.webp?v=1780294389)

##### **User-Friendly Installation**

  

Say goodbye to complicated setups! This mobile signal booster is designed for effortless installation, allowing you to enhance your mobile signal without the need for professional help. Just plug it in and enjoy improved connectivity.  
![Car Vehicle Mobile Phone Signal Booster Improve Signal Feature](https://cdn.shopify.com/s/files/1/0488/4129/3976/files/Car-Signal-Booster-Feature2.webp?v=1780294389)

##### **Automatic Signal Adjustment**

  

Equipped with automatic gain control, this booster intelligently adjusts its performance based on external signal strength. This ensures optimal signal amplification, providing you with a reliable connection at all times.  
![Car Vehicle Mobile Phone Signal Booster Improve Signal Feature](https://cdn.shopify.com/s/files/1/0488/4129/3976/files/Car-Signal-Booster-Feature3.webp?v=1780294389)

##### **Versatile Power Options**

  

The booster offers flexible power options, including a 5VAC adapter, mobile power, and vehicle power adapter. This versatility allows you to use it in various settings, whether at home, in your car, or on the go.  
![Car Vehicle Mobile Phone Signal Booster Improve Signal Feature](https://cdn.shopify.com/s/files/1/0488/4129/3976/files/Car-Signal-Booster-Feature4.webp?v=1780294389)

##### **Health-Conscious Technology**

  

With its low radiation design, this mobile signal booster not only enhances your signal but also reduces the radiation intensity emitted by your phone. Enjoy better connectivity while prioritizing your health and safety.  
![Car Vehicle Mobile Phone Signal Booster Improve Signal Feature](https://cdn.shopify.com/s/files/1/0488/4129/3976/files/Car-Signal-Booster-Feature5.webp?v=1780294389)

##### **Eco-Friendly Operation**

  

Designed with environmental protection in mind, the booster can be easily unplugged when not in use, eliminating unnecessary radiation and energy consumption. Stay connected while being kind to the planet.  
![Car Vehicle Mobile Phone Signal Booster Improve Signal Feature](https://cdn.shopify.com/s/files/1/0488/4129/3976/files/Car-Signal-Booster-Feature6.webp?v=1780294389)

## **3 Steps to Full Bars**

## 1\. Place the Outdoor Antenna

Mount the antenna where you get the best signal.  
![Car Vehicle Mobile Phone Signal Booster Improve Signal Install](https://cdn.shopify.com/s/files/1/0488/4129/3976/files/Car-Signal-Booster-Install1.webp?v=1780294387)  
  

## 2\. Connect the Booster Inside

Plug in the booster and connect to the antenna.  
![Car Vehicle Mobile Phone Signal Booster Improve Signal Install](https://cdn.shopify.com/s/files/1/0488/4129/3976/files/Car-Signal-Booster-Install2.webp?v=1780294387)  
  

## 3\. Enjoy Full Bars Everywhere

Clear calls, fast data, and no more dead zones.  
![Car Vehicle Mobile Phone Signal Booster Improve Signal Install](https://cdn.shopify.com/s/files/1/0488/4129/3976/files/Car-Signal-Booster-Install3.webp?v=1780294387)  
  

## Mobile Signal Booster, Car Signal Booster, O2 Vodafone Giffgaff, UK Mobile Network, Voice Calls Amplifier, Vehicle Signal Improvement, 900MHz Frequency Booster, External Aerial Installation

It boost **Calls** signal on 900MHz frequency, the frequency used in UK used by mobile networks to deliver their mobile services: 2G (also known as GSM). It can boost all networks on O2, Vodafone, giffgaff, TalkTalk, Lyca Mobile, Lebara, Tesco, Talk and Sky Mobile for improving **Voice Calls & Text** signal.

* * *

**Clear Voice**  
No Miss Important Calls

**Send/Receive SMS**  
SMS Text Messages Quickly

**Signal Wider Coverage**  
Vehicle Signal Improved

* * *

  

### Upgrade External Aerial

External fishtail aerial connects via 3 meter coax lead to the signal booster unit which is located inside the car. The aerial with **Three** magnets, its more stable.  
![Mobile Signal Booster, Car Signal Booster, O2 Vodafone Giffgaff, UK Mobile Network, Voice Calls Amplifier, Vehicle Signal Improvement, 900MHz Frequency Booster, External Aerial Installation for car vehicle Upgrade External Aerial of fishtail aerial bottom](https://cdn.shopifycdn.net/s/files/1/0488/4129/3976/files/ProductPageFishtailAerialUpgradedBottom.webp?v=1600636900)  
![Mobile Signal Booster, Car Signal Booster, O2 Vodafone Giffgaff, UK Mobile Network, Voice Calls Amplifier, Vehicle Signal Improvement, 900MHz Frequency Booster, External Aerial Installation for car vehicle Upgrade External Aerial of fishtail aerial](https://cdn.shopifycdn.net/s/files/1/0488/4129/3976/files/ProductPageFishtailAerial.webp?v=1600636899)

* * *

### Features

**1\. Convenient**\--- small beautiful appearance (cigarette box size), easy to carry, suitable for a variety of small space signal coverage.  
**2\. Easy to use**\--- needs no complicated installation.  
**3\. Open**\--- according to the external signal strength, automatic gain control ensure the signal.  
**4\. Flexible**\---- can choose different power adapters, such as 220VAC adapter, mobile power, vehicle power adapter etc.  
**5\. Low radiation**\--- a good signal coverage can reduce the radiation intensity of the mobile phone itself, effectively reduce the mobile phone radiation may harm the human body.  
**6\. Environmental protection**\--- when you do not need to use the telephone or the Internet, can be removed at any time or unplug the power, elimination of radiation.

![Mobile Signal Booster, Car Signal Booster, O2 Vodafone Giffgaff, UK Mobile Network, Voice Calls Amplifier, Vehicle Signal Improvement, 900MHz Frequency Booster, External Aerial Installation for car vehicle 01](https://cdn.shopifycdn.net/s/files/1/0488/4129/3976/files/ProductPageCV01.webp?v=1600636899)  
![Mobile Signal Booster, Car Signal Booster, O2 Vodafone Giffgaff, UK Mobile Network, Voice Calls Amplifier, Vehicle Signal Improvement, 900MHz Frequency Booster, External Aerial Installation for car vehicle 02](https://cdn.shopifycdn.net/s/files/1/0488/4129/3976/files/ProductPageCV02.webp?v=1600636900)

  

### Specification

(scroll to view all)

Application & Bands

Car, Vehicle Voice Calls (Band 8)

Country

United Kingdom

**Boost All On**

O2 (2G)  
Vodafone (2G)  
giffgaff (2G)  
Lebara (2G)  
Lyca Mobile (2G)  
Sky Mobile (2G)  
TalkMobile (2G)  
TalkTalk (2G)  
Tesco (2G)

Users Supporting

10 Simultaneously

Band

Single Band 8

Frequency

900MHz

Gain(dB)

Uplink 45±2; Downlink 40±2

Up-link

890~915 MHz

Down-link

935~960 MHz

Export Power(Po)

Uplink 10; Downlink 10

Power Adapter

5V DC

What’s Included

1 x Car Signal Booster / Amplifier  
1 x External Aerial  
1 x Interior Aerial  
1 x 5V DC Car Power Adapter

**Warming Tips:**  
-   Band Confirmation: This booster can boost signals on Band 8, 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.

  

### **How It Works**

  

![how Mobile Signal Booster, Car Signal Booster, O2 Vodafone Giffgaff, UK Mobile Network, Voice Calls Amplifier, Vehicle Signal Improvement, 900MHz Frequency Booster, External Aerial Installation work for Car Vehicle](https://cdn.shopifycdn.net/s/files/1/0488/4129/3976/files/ProductPageHIWcar-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.  
  

1.  Outside Antenna: Pulls in tower Signal.
2.  Signal Booster: Amplifies the Signal.
3.  Inside Antenna: Re-broadcasts Signal.
4.  Mobile Phone: Gets Boosted Signal.

![how Mobile Signal Booster, Car Signal Booster, O2 Vodafone Giffgaff, UK Mobile Network, Voice Calls Amplifier, Vehicle Signal Improvement, 900MHz Frequency Booster, External Aerial Installation work for Car Vehicle](https://cdn.shopifycdn.net/s/files/1/0488/4129/3976/files/ProductPagehowitworksvehicles.webp?v=1600636900)

#### **Installation**

1.  Mount external aerial on top back.
2.  Install the booster and interior antenna.
3.  External aerial connect to "BS" on the booster, and interior antenna connect to "MS".

**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)

![how Mobile Signal Booster, Car Signal Booster, O2 Vodafone Giffgaff, UK Mobile Network, Voice Calls Amplifier, Vehicle Signal Improvement, 900MHz Frequency Booster, External Aerial Installation work for Car Vehicle](https://cdn.shopifycdn.net/s/files/1/0488/4129/3976/files/ProductPageCarVehicle02.webp?v=1600636900)

  

### **Application Scenarios**

  

![Mobile Signal Booster, Car Signal Booster, O2 Vodafone Giffgaff, UK Mobile Network, Voice Calls Amplifier, Vehicle Signal Improvement, 900MHz Frequency Booster, External Aerial Installation vehicle car truck suv van application](https://cdn.shopifycdn.net/s/files/1/0488/4129/3976/files/application-vehicle-car.jpg?v=1698366474)

![Mobile Signal Booster, Car Signal Booster, O2 Vodafone Giffgaff, UK Mobile Network, Voice Calls Amplifier, Vehicle Signal Improvement, 900MHz Frequency Booster, External Aerial Installation vehicle car truck suv van application](https://cdn.shopifycdn.net/s/files/1/0488/4129/3976/files/application-vehicle-truck.jpg?v=1698366474)

![Mobile Signal Booster, Car Signal Booster, O2 Vodafone Giffgaff, UK Mobile Network, Voice Calls Amplifier, Vehicle Signal Improvement, 900MHz Frequency Booster, External Aerial Installation vehicle car truck suv van application](https://cdn.shopifycdn.net/s/files/1/0488/4129/3976/files/application-vehicle-suv.jpg?v=1698366473)

![Mobile Signal Booster, Car Signal Booster, O2 Vodafone Giffgaff, UK Mobile Network, Voice Calls Amplifier, Vehicle Signal Improvement, 900MHz Frequency Booster, External Aerial Installation vehicle car truck suv van application](https://cdn.shopifycdn.net/s/files/1/0488/4129/3976/files/application-vehicle-van.jpg?v=1698366473)

## Full Technical Specifications

Parameter

Value

Model

CVG / MBCVGgb

Application

Car, Van, Truck, Motorhome, Boat, Vehicle

Frequency Band

Band 8 (900 MHz) FDD GSM

Uplink Frequency

890 – 915 MHz

Downlink Frequency

935 – 960 MHz

Supported Services

2G GSM (Voice Calls & SMS)

Uplink Gain (Gp)

45 ± 2 dB

Downlink Gain (Gp)

40 ± 2 dB

Max Output Power (Po)

Uplink 10 dBm / Downlink 10 dBm

Simultaneous Users

Up to 10

Supported Networks (2G)

O2, Vodafone, giffgaff, Lebara, Lycamobile, Sky Mobile, TalkMobile, TalkTalk, Tesco Mobile

External Aerial

Magnetic-mount, roof/bonnet placement

Interior Aerial

Compact cabin antenna

Power Adapter

5V DC car cigarette lighter / USB

Power Consumption

≤ 5 W

Operating Temperature

\-20°C to +60°C

Certification

UKCA / CE, Ofcom Licence-Exempt

Price

£109.99 GBP

## What's in the Box

Item

Quantity

Description

CVG Car Booster Unit

1

Compact Band 8 amplifier with LED indicators

External Aerial

1

Magnetic-mount, roof/bonnet, weatherproof

Interior Aerial

1

Compact cabin antenna, adhesive mount

5V DC Car Power Adapter

1

Cigarette lighter / USB power

Cable Set

1

Connection cables for aerial and booster

User Manual

1

Step-by-step vehicle installation guide

## How the CVG Works in Your Vehicle

1.  **Receives:** The magnetic-mount external aerial on the roof captures weak 900 MHz Band 8 signal from the nearest O2/Vodafone mast, even while driving.
2.  **Amplifies:** The compact booster unit amplifies the signal by 45 dB (uplink) and 40 dB (downlink), filtering out noise and interference.
3.  **Broadcasts:** The interior aerial rebroadcasts the boosted signal throughout the vehicle cabin, reaching all passengers' phones.
4.  **Returns:** Uplink signals from passengers' phones are amplified and sent back to the mast via the external aerial.

## Compatible Vehicles

Vehicle Type

Suitability

Notes

Cars / Saloons / Hatchbacks

Excellent

Standard installation, magnetic roof aerial

SUVs / 4x4s

Excellent

Larger cabin, interior aerial on dashboard

Vans / Delivery Vehicles

Very Good

External aerial on roof, interior in cab

Trucks / HGVs

Very Good

24V adapter may be needed (check)

Motorhomes / Campervans

Excellent

Can be semi-permanent installed

Caravans

Good

Works when towed, external aerial on roof

Boats / Narrowboats

Good

Marine environment, ensure waterproof connections

Taxis / Private Hire

Excellent

Reliable calls for drivers and passengers

## Pros & Cons

### Advantages

-   **Vehicle-specific design:** The only booster in the Boost4U range designed for cars, vans and motorhomes.
-   **Band 8 900 MHz:** Best building/vehicle penetration band; works with O2, Vodafone and all their MVNOs.
-   **Improves calls & SMS:** Eliminates dropped calls and unsent texts while driving.
-   **10 simultaneous users:** Enough for all passengers in a car or van.
-   **5V DC car power:** Plugs into cigarette lighter or USB — no mains needed.
-   **Magnetic external aerial:** Quick installation on roof or bonnet, no drilling.
-   **Compact size:** Booster unit fits under seat, in glove box or on dashboard.
-   **Ofcom legal:** Licence-exempt, UKCA/CE certified, automatic gain control.
-   **Affordable:** At £109.99, one of the cheapest vehicle call boosters in the UK.
-   **365-day returns:** Longest money-back guarantee in the market.

### Disadvantages

-   **2G calls only:** Does NOT boost 4G data or 3G. Only voice calls and SMS on Band 8.
-   **Not for EE/Three:** Band 8 is used by O2/Vodafone. EE and Three use different bands for calls.
-   **Requires outdoor signal:** Must have 1–2 bars outside the vehicle. Cannot create signal from nothing.
-   **Signal varies while driving:** As you move between masts, signal strength fluctuates. The booster handles this but may have brief dropouts in very remote areas.
-   **External aerial on roof:** Magnetic mount may not adhere to glass roofs or non-metal body panels.
-   **Standard delivery 10–15 days:** Not next-day delivery.
-   **No 5G support:** No consumer booster currently supports 5G.
-   **Installation in vehicle:** Requires routing cables from roof to cabin, which may be tricky in some vehicles.
-   **5V power only:** May need adapter for 24V truck systems.
-   **Metal vehicle body:** The car body itself blocks signal — the external aerial must be outside (on roof) to work.

## Supported Networks Detail

Network

2G Calls/SMS on Band 8

Notes

O2

Yes

Primary network, full Band 8 support

Vodafone

Yes

Primary network, full Band 8 support

giffgaff

Yes

Uses O2 infrastructure

Lebara

Yes

Uses Vodafone infrastructure

Lycamobile

Yes

Uses Vodafone infrastructure

Sky Mobile

Yes

Uses O2 infrastructure

TalkMobile

Yes

Uses Vodafone infrastructure

TalkTalk Mobile

Yes

Uses O2 infrastructure

Tesco Mobile

Yes

Uses O2 infrastructure

EE

No

EE uses Band 3 (1800 MHz) for 2G

Three

No

Three does not operate 2G on Band 8

## Installation Guide for Vehicles

1.  **Find the signal:** Park in an area with 1–2 bars of O2/Vodafone signal. Use your phone to confirm Band 8 (900 MHz) is available.
2.  **Mount external aerial:** Place the magnetic-mount aerial on the centre of the vehicle roof (best signal) or on the bonnet. Ensure it is flat and secure.
3.  **Route cable:** Run the aerial cable through the door rubber seal or window gap into the cabin. Avoid pinching the cable.
4.  **Connect booster:** Plug the external aerial cable into the "BS" port on the booster unit. Connect the interior aerial to the "MS" port.
5.  **Place interior aerial:** Position the interior aerial on the dashboard or under a seat, facing the passenger area.
6.  **Power on:** Plug the 5V DC adapter into the cigarette lighter or USB port. The booster will calibrate automatically (10–15 seconds).
7.  **Test:** Check signal bars on your phone. Make a test call. Adjust aerial position if needed.

**Installation time:** 15–30 minutes. **Tools needed:** None (magnetic mount, no drilling). Cable ties recommended for neat cable routing.

## Frequently Asked Questions

### Will the CVG work in my car?

Yes, the CVG works in any car, van, truck or motorhome with a 12V/5V power outlet and a metal roof for the magnetic aerial. It supports O2, Vodafone and all their MVNOs (giffgaff, Sky, Lebara, Lycamobile, Tesco, TalkTalk, TalkMobile). You need at least 1–2 bars of outdoor signal.

### Does the CVG improve 4G data in the car?

No. The CVG is a Band 8 (900 MHz) 2G booster that improves voice calls and SMS only. It does not boost 4G LTE data. For in-car 4G data, consider a mobile WiFi hotspot or a 4G router with external antenna.

### Will it work with EE or Three?

No. The CVG operates on Band 8 (900 MHz), which is used by O2 and Vodafone for 2G calls. EE uses Band 3 (1800 MHz) and Three does not operate a 2G network. The CVG will not improve EE or Three calls.

### How is the CVG powered?

The CVG uses a 5V DC car power adapter that plugs into the vehicle's cigarette lighter socket or USB port. It consumes approximately 5 W, so it will not drain your car battery when the engine is running. Turn it off when the engine is off to avoid battery drain.

### Is the CVG legal to use while driving?

Yes. The CVG is Ofcom licence-exempt with UKCA/CE certification. It operates within Ofcom's power limits and includes automatic gain control to prevent network interference. It is legal to use in any vehicle on UK roads.

### Do I need to drill holes in my car?

No. The external aerial uses a strong magnetic mount that attaches to the vehicle roof or bonnet. The cable routes through the door rubber seal. No drilling or permanent modification is required.

### Will the magnetic aerial damage my car paint?

The magnetic aerial has a rubberised base that protects the paintwork. It is designed for temporary or permanent vehicle use. For long-term installation, we recommend periodically cleaning under the aerial to prevent dirt buildup.

### How much does the CVG cost?

£109.99 GBP including the booster unit, external magnetic aerial, interior aerial, 5V DC car power adapter, cables and user manual. Free UK shipping. 365-day money-back guarantee included.

### What if it doesn't work in my vehicle?

The CVG comes with a 365-day money-back guarantee. If it does not improve your in-car signal for any reason within 365 days, return it for a full refund (minus shipping costs). Most signal issues are resolved by repositioning the external aerial.

### Can I use the CVG in a motorhome or caravan?

Yes. The CVG works well in motorhomes, campervans and caravans. For permanent installation in a motorhome, you can mount the external aerial on the roof and route cables internally. The 5V adapter works from the vehicle's leisure battery or cigarette lighter.

## Related Blog Articles

-   [Best Car Mobile Signal Booster UK 2025 — Comparison & Reviews](https://www.ukmobilebooster.com/en-gb/blogs/news/best-car-mobile-signal-booster-uk-2025-complete-comparison-reviews)
-   [Boost4U CVG Review UK — In-Car Call Booster Tested](https://www.ukmobilebooster.com/en-gb/blogs/news/boost4u-cvg-review-uk-21-day-in-car-call-booster-test)
-   [How to Boost Mobile Signal in Car UK — Complete Guide](https://www.ukmobilebooster.com/en-gb/blogs/news/how-to-boost-mobile-signal-in-car-uk-complete-guide-2025)
-   [Band 8 900MHz Car Signal Booster for O2 Vodafone UK](https://www.ukmobilebooster.com/en-gb/blogs/news/band-8-900mhz-car-signal-booster-for-o2-vodafone-uk-full-technical-guide)

 

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## Details

- **Price:** 109.99 GBP - 137.56 GBP
- **Vendor:** UKMobileBooster.com
- **Type:** United Kingdom
- **Tags:** application vehicle, application Voice Calls, frequency 900MHz, gb gb, gb giffgaff, gb lebara, gb lycamobile, gb o2, gb sky, gb talk, gb talktalk, gb tesco, gb vodafone, has_stock_countdown, provider giffgaff, provider Lebara, provider lycamobile, provider O2, provider Sky Mobile, provider Talk Mobile, provider talktalk, provider Tesco, provider Vodafone, search list

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| No | 109.99 GBP | In stock |
| Yes | 137.56 GBP | In stock |

## Images

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> Source: [B4U](https://www.ukmobilebooster.com/products/cvg-mobile-booster)
> Updated: 2026-09-06