Internet in the car: how to turn your car into a fully-fledged mobile hotspot for your travels

Why a car router is better than sharing a connection from a smartphone

A car’s body acts on a radio signal in much the same way as closed doors do for a conversation: you can still hear the voice, but the quality is poorer. A smartphone’s antenna is small, and it also has to maintain a connection with the mobile mast whilst simultaneously providing Wi-Fi to passengers. As a result, speeds drop and the battery drains quickly.

A mobile router solves this problem: it focuses solely on the internet. External antennas can be connected to it, and it draws its power from the car’s electrical system.

How to choose a router

• Network type. For most journeys, 4G (LTE) is sufficient. Routers with 5G support are only worthwhile where there is adequate coverage: check your mobile operator’s coverage map before buying, as there may be no 5G coverage at all on the motorway.
• SIM card slot. This is a mobile router, and it is the SIM card that provides it with an internet connection.
• Two sockets for external antennas (SMA or similar). These are needed if you plan to boost the signal using antennas. For example, some models have a pair of these sockets under a cover on the rear panel.
• Power supply. Check the sticker or the power adaptor: it will specify the voltage (e.g. 5V, 9V or 12V) and the current.
• Number of devices. If a family travelling in the car has several mobile phones, tablets and a laptop, check how many devices the router can support simultaneously. This is usually specified in the technical specifications.

There are two types of routers: stationary (which require mains power) and portable (which have a built-in battery). Both are suitable for use in a car, but it is better to power the stationary one from the car’s electrical system and keep the portable one as a backup.

External antennas: why you need them and how to connect them

An antenna doesn’t make the internet any faster; it helps you find a signal. It’s like a torch with a lens: it doesn’t shine any brighter, but it focuses the beam in the right direction. In places where your smartphone shows just one bar, an antenna often provides a stable connection.

MIMO: two antennas instead of one

Most modern 4G routers use MIMO technology. Put simply, it’s like having a dual-carriageway instead of a single lane: data travels via two channels simultaneously. Therefore, there must be two antennas, and both must be connected for MIMO to work properly. If only one is connected, the speed and stability will be lower.

• The two cables leading to the antennas must be the same length.
• Do not place the antennas right next to each other: they need some space between them so they do not interfere with one another.
• Twist the cables as tightly as possible, but without using excessive force.
• On some routers, after connecting the antennas, you’ll need to switch the mode to «External» in the web interface; otherwise, the router will continue to use the internal antennas.

Which antenna to choose for your car

Omnidirectional magnetic antennas mounted on the roof are best suited for driving: they pick up the signal from all directions, regardless of which way the car is facing. Panel (directional) aerials are best for long-term parking, such as at a campsite or in a motorhome: they are aimed at the operator’s mast, and this gives the best reception. They are not suitable for use whilst driving.

It is best to route the antenna cable through the door or boot seal, without drilling into the bodywork. Check that nothing is pinching the cable.

Power from the vehicle’s electrical system: 12V and USB-C

Powering the router from the car battery is convenient and safe if you follow these steps:

1. Check the specifications on your router’s power supply unit. You’ll need the voltage (V) and current (A) ratings.
2. Choose a cigarette lighter adapter. A standard passenger car has a 12V on-board electrical system. Lorries and some buses have a 24V system, so the adapter must support this input.
3. Check the specifications. The adapter’s voltage must match that required by the router, and its current rating must be at least as high as required. Insufficient power will cause the router to reboot.
4. For routers powered via USB-C, use a high-quality car charger with the appropriate power rating. If the router requires 12V, a standard 5V USB-C cable will not work: look for a cable or adapter with the correct voltage.
5. Keep cables out of the way. Route them so that they do not obstruct the driver or become frayed.

It’s worth noting that, in some cars, the cigarette lighter socket switches off when the ignition is turned off, whilst in others it remains on at all times. If the router is powered by the vehicle’s electrical system whilst the engine is off, it will drain the battery. For long periods of parking, a power bank or portable charging station is more convenient. We share some useful tips on powering your router from a power bank in a separate article.

How to set up Wi-Fi in your car

Everything is set up once via the router’s web interface:

• Insert the SIM card and check whether the router can detect the mobile network.
• Set the network name and password. Use WPA2 or WPA3 encryption, and choose a strong password: you don’t want unauthorised users connecting to your network whilst you’re on the road.
• Choose between the 2.4 GHz or 5 GHz band. The 2.4 GHz band has a greater range and penetrates obstacles better, whilst the 5 GHz band is faster but has a shorter range. Both are suitable for a car’s interior, and if you have a choice, you can reserve the 5 GHz band for laptops and tablets.
• Position the router correctly. Don’t hide it under a seat or in the glove compartment: metal parts and the vehicle’s bodywork will weaken the signal. The best place is closer to the centre of the cabin.
• Update the firmware in advance. It’s best to do this at home, before setting off. We explain how to do it properly here.

Data allowances for passengers and children: how to use them wisely

Mobile internet comes with restrictions: either a data allowance measured in gigabytes, or an «unlimited» plan subject to fair usage policies. It is therefore important to ensure that children’s cartoons do not use up the entire allowance within the first hour. As a rough guide, one hour of watching videos in high quality uses 1.5-3 GB of mobile data, whilst standard quality uses less. The exact figures depend on the service and quality settings.

Here’s how to save mobile data:

• Download content in advance. It’s worth downloading cartoons, playlists, maps and podcasts at home. Most video services and apps have an offline viewing mode. Home broadband is the most convenient option for this: if you have fibre broadband, such as GPON from Maxnet, even large files download in a matter of minutes, rather than eating into your mobile data allowance.
• Turn off auto-updates for apps and games. They often start updating at the most inconvenient moments.
• Reduce the video quality. Standard quality is usually sufficient for a tablet screen in the car.
• Turn off autoplay. One episode after another can «eat up» your data allowance whilst the children are asleep.
• Set up a guest network or set a limit for each device, if your router supports this. That way, the most «data-hungry» gadget won’t leave the others without the internet.
• Set a schedule and limits. Some routers allow you to restrict access times or speeds for individual devices, which is handy for children’s tablets.
• Keep an eye on your data usage. Many routers display this and can alert you when your data allowance is running out.

A separate note on areas without coverage: on motorways and in mountainous terrain, the signal disappears completely. It’s therefore best to download navigation maps offline as well.

Working from the car

If your car serves as a temporary office for remote working, there are a few more points to add to the list above:

• Video calls require a stable connection more than high speed. As a rough guide, an hour-long call can use between 0.5 and 1 GB.
• Stop where the signal is stronger. Check it in advance using your mobile provider’s app or a simple speed test.
• Have a backup plan ready. A second SIM card from a different provider or mobile data on your phone can come to the rescue when your main network «goes down».
• Use a VPN for work systems, especially when connecting to public Wi-Fi networks.

Drivers should not use gadgets whilst driving: set everything up before the journey begins or at stops, and leave video calls and watching videos to the passengers.

Starlink Mini: a more expensive alternative

If mobile coverage drops out for long periods along your route, or if you need internet access every day whilst travelling for work, there is another option: the Starlink Mini satellite dish. It is compact and has a built-in Wi-Fi router, so there is no need to buy a separate router or external antennas. The unit is mounted on the roof or set up at a lay-by, and the connection is via satellites rather than mobile masts.

There are a few things to bear in mind before you buy:

• The sky must be clear. The signal will be lost in a forest, under dense tree canopies, in a tunnel or amongst dense urban buildings.
• You’ll need a Roam tariff to use the service whilst on the move. Standard home tariffs aren’t suitable for this. Tariff terms and prices are subject to change, so please check the Starlink website for the latest information.
• Power supply. The terminal consumes approximately 20-40 W, so it drains the battery quickly when the vehicle is stationary with the engine off. A special cable or cigarette lighter adapter is required to connect it; a standard USB charger will not work.
• Price. In Ukraine, the terminal itself currently costs from 18,000 hryvnias, and you’ll then need to pay a monthly subscription fee.

Therefore, the Starlink Mini is best suited to long road trips and areas without mobile coverage. For ordinary trips out of town, a 4G router with external antennas will suffice.

What to do at home before setting off

It’s best to get everything sorted whilst the car is still in the driveway and you have a stable internet connection at home:

1. Update your router’s firmware and the apps on your devices.
2. Download cartoons, films, music and offline maps.
3. Check your SIM card, data allowance and roaming conditions if you’re planning to travel abroad.
4. Connect the router to the car’s power supply and check that it starts up.
5. Secure the antennas and check the signal strength over a short distance.

A properly configured router will help passengers stay connected, allow children to watch their favourite cartoons, and enable you to get some work done during a stop if necessary. And don’t forget that even the most convenient hotspot should remain a travel aid, rather than distracting the driver from the road.