IoT SIM cards for vending machines: multi-network 4G for cashless and telemetry Leave a comment

The Router Store supplies multi-network IoT SIM cards for vending machines, smart fridges, coffee machines and micro markets, for vending operators, telemetry installers and machine builders across the UK. 95% of UK pay-vend machines now take cashless payments, so a machine without a mobile signal is a machine that cannot sell. This guide explains what a vending SIM has to do, what the 2G and 3G switch-offs mean for your card readers and telemetry, and how to choose connectivity that keeps every machine trading. To talk about your estate now, call 0300 124 6181 or email sales@routerstore.com.

Vending machine SIM cards from The Router Store at a glance

• Multi-network: connects to the strongest available UK network at each machine, not a single operator.
• 4G connectivity: for card readers and telemetry units moving off 2G and 3G.
• Machine terms, not consumer terms: IoT SIMs suited to low, steady data use, with no pay as you go credit to run out.
• Fixed IP option: for sites where you need to reach a router or telemetry gateway remotely.
• Antennas and routers too: external antennas, signal analysers and 4G routers for problem sites and multi-machine locations.
• Quoted for your estate: pricing based on machine numbers and your renewal dates.
• UK team: over 25 years in UK cellular, M2M and router connectivity.

What does a SIM card do in a vending machine?

A vending machine SIM gives the machine its own mobile data connection. It does not need a phone line, site Wi-Fi or a network cable from the host building. That matters because most vending machines sit on someone else’s premises.

The SIM usually sits in the cashless card reader or a separate telemetry unit (telemeter). These connect to the vending machine controller (VMC) over MDB, the Multi-Drop Bus standard used by coin mechanisms, note validators and cashless devices. The SIM then carries three types of traffic:

• Card and mobile payments: contactless card, Apple Pay and Google Pay authorisations sent to the payment processor.
• Telemetry: sales, stock and cash audit data (DEX or EVA-DTS) sent to your vending management system, so route planners fill only the machines that need it.
• Alerts and control: fault codes, door-open and temperature alarms, plus remote price and planogram changes.

Smart fridges and micro markets add more. A smart fridge needs to authorise a card before it unlocks the door. Many also send camera or weight sensor data to work out what was taken. As a result, they use more data and are less tolerant of a weak signal than a snack machine.

Why connectivity now decides vending revenue

According to the AVA 2025 Census and Market Report, the UK vending, coffee services and automated retail industry generated £3.78 billion in 2025. Cashless technology is fitted to 95% of pay-vend machines, and around 30% no longer take cash at all. On cashless-enabled machines, 84% of transactions are cashless and 62% are made with a phone or smartwatch.

The same census reports that cashless customers spend around double per transaction compared with cash. Therefore, when a card reader loses signal, the machine loses its highest-value sales first. On a cashless-only machine, it loses every sale.

Two ways to connect a vending machine

A SIM in each card reader or telemeter

This is the most common set-up. Each card reader or telemetry unit has a built-in cellular modem and its own SIM. It suits single machines in offices, hospitals, stations, gyms and car parks.

Many cashless payment providers bundle connectivity into their monthly service fee. If yours does, check whether they allow third-party SIMs before you change anything. In that case, our SIMs connect the rest of your estate: standalone telemetry units, coffee machines, smart fridges, kiosks and screens.

A 4G router serving several machines

Micro markets, staff canteens and transport hubs often have a bank of machines in one place. A single industrial 4G router with one multi-network SIM can connect all of them over Ethernet or Wi-Fi. This works for any device that supports a wired or Wi-Fi connection and where your payment provider permits it.

A compact router such as the Teltonika RUT200 or Teltonika RUT241 fits inside a cabinet or plant room. Both run RutOS and work with Teltonika RMS, so you see signal strength and data use for every site from one dashboard. In addition, a router gives you one SIM to manage per site instead of one per machine.

Why vending SIMs are changing now

Three network changes affect vending card readers and telemetry units at the same time.

• 3G has gone. All UK networks have now switched off 3G. Readers that used 3G now fall back to 2G or fail to connect.
• 2G switch-off from 2029. According to Ofcom, EE starts switching off 2G from May 2029 and Vodafone switches off its 2G network during 2030. All UK operators have committed to close 2G by 2033 at the latest.
• O2 2G roaming has closed. In October 2025, Virgin Media O2 stopped non-O2 SIMs roaming onto its 2G network. Readers on older roaming SIMs that relied on O2 2G as a fallback can now fail in weak signal areas.

A card reader that dropped from 3G to 2G still works on paper. However, 2G is slow, so payment authorisations take longer and time out more often at busy machines. If you have readers on 2G today, plan their replacement now rather than in 2029.

What to look for in an IoT SIM for vending machines

• Multi-network coverage: vending machines sit in basements, hospital corridors, underground car parks and station concourses. A SIM locked to one network fails wherever that network is weak. Our multi-network SIM cards select the strongest available network.
• 4G support on your hardware: the SIM, the reader and the network all need to support 4G. Some newer readers use LTE-M (Cat-M1), and LTE-M availability differs between UK networks, so check what your device uses.
• Terms suited to machines: consumer pay as you go SIMs can lapse when credit runs out or be barred for low use. An IoT SIM stays active between transactions.
• The right IP type: card readers and telemeters make outbound connections, so a standard dynamic IP works for most estates. You need a fixed IP only when you connect inbound, for example to a router or telemetry gateway. Our guide to fixed IP SIM cards explains the difference.
• Correct APN: a wrong APN is one of the most common reasons a new SIM will not connect. See our guide to APN settings.
• One account for the estate: SIMs bought with different reader brands and from different suppliers are hard to track. Consolidating them onto one account and one renewal cycle cuts lapsed SIMs and wasted callouts.

Common vending connectivity problems we fix

Most vending SIM problems are simple. They are expensive because each one costs sales and often an engineer visit.

• Cards declined or timing out: usually a weak signal or a reader that has fallen back to 2G.
• Machine shows offline in the VMS but still trades cash: the telemetry link has dropped, so route planning runs blind.
• Consumer SIMs that lapse: pay as you go SIMs fitted during an install, then forgotten until the reader stops.
• Single-network SIMs in dead spots: a machine moved to a new site where its network does not reach.
• Stub antennas inside a steel cabinet: the machine itself blocks the signal the reader needs.

Weak signal: getting a vending machine online

A vending machine is a steel box, often placed against a wall or in a basement. That combination is hard on a small internal antenna. A multi-network SIM fixes most coverage problems, and an external antenna fixes most of the rest.

• Survey first: measure 4G signal on every network at the machine position with a 4G signal analyser.
• Move the antenna, not the machine: a magnetic mount 4G antenna sits on top of the steel cabinet, above the metalwork, on a short cable to the reader.
• Use a wall or roof antenna for the worst sites: a panel mount 4G antenna on a short low-loss cable turns a failing basement site into a reliable one.
• Cover the low bands: low-frequency 4G bands such as Band 20 (800 MHz) carry furthest into buildings. Choose an antenna that covers them.

Check the antenna connector on your reader or telemeter before ordering, as connector types vary between manufacturers. We stock 4G antennas and cables and can recommend a set-up for problem sites.

Payment security: what the SIM does and does not do

Modern cashless readers encrypt card data at the point of capture, before it leaves the device. The SIM and mobile network carry that encrypted traffic to the payment processor. Therefore, the SIM is a transport, not a security control for card data.

Your PCI DSS responsibilities depend on your payment provider and terminal, not on which SIM carries the data. Changing SIM supplier does not change them. However, confirm with your payment provider before swapping a SIM in a payment device, because some providers certify their reader with their own connectivity.

eSIM and vending estates

A vending machine can stay in service for ten years or more, longer than most connectivity contracts. SGP.32, the GSMA eSIM standard for IoT, lets a device switch mobile operator profiles over the air without a site visit to change a physical SIM.

For vending operators, the value is flexibility. You can move a whole estate to a new network or tariff without touching each machine. It depends on the reader or telemeter supporting an eUICC, so adoption will be gradual. Ask us about IoT eSIM if you are specifying new hardware or planning a long multi-year contract, or read our guide to eSIM routers.

How switching your vending SIMs works

• Tell us about your estate: number of machines, card reader and telemeter models, current SIM supplier and renewal dates, and site postcodes.
• We check compatibility and coverage: we confirm the SIM suits your devices and that our networks reach your sites.
• Order your SIMs: we supply SIMs once compatibility and coverage are confirmed.
• Fit at the next visit: swap the SIM during a routine fill or service, then confirm a test transaction and a telemetry upload.
• Renew on time: keep every SIM on a known renewal date, so nothing lapses between visits.

Why buy vending SIM cards from The Router Store

• Connectivity specialists: The Router Store is the trading name of Millbeck Communications, supplying M2M and IoT SIM cards to UK businesses.
• Multi-network experience: we supply multi-network and roaming SIM cards across UK networks for unattended and hard-to-reach equipment, including lift SIM cards.
• SIMs, antennas and routers in one place: SIM cards, external antennas, signal analysers and industrial 4G routers for multi-machine sites. We are an official Teltonika UK Diamond Partner.
• UK-based team: over 25 years in UK cellular, M2M and router connectivity.

Frequently asked questions

What SIM card does a vending machine card reader use?

Most cashless readers and telemeters have a built-in 4G modem that takes a standard IoT data SIM. The SIM size varies by device, so check the slot or the manufacturer’s manual. Some readers use a soldered embedded SIM instead. Send us the reader model and we will confirm what fits.

Will my vending card reader stop working when 2G switches off?

If it only supports 2G, yes. EE starts switching off 2G from May 2029 and Vodafone during 2030, and all UK 2G closes by 2033. Readers that support 4G will keep working with a 4G-capable SIM. Check your reader models now and plan replacements before your networks close.

How much data does a vending machine use?

Card authorisations and telemetry uploads are small, so a standard snack or drinks machine uses little data each month. Smart fridges with cameras, digital advertising screens and remote video use far more. Tell us the devices in each machine and we will size the right plan.

Do I need a fixed IP SIM for a vending machine?

Usually not. Card readers and telemeters connect outbound to their payment and telemetry platforms, which works on a standard dynamic IP. You need a fixed IP SIM only when you connect inbound, for example to manage a router or telemetry gateway remotely.

Can I use a normal mobile phone SIM in a vending machine?

It is not a good idea. Pay as you go SIMs can lapse or be barred for low use, and they are locked to one network. An IoT SIM is built for machines that sit unattended for months and uses whichever network is strongest at the site.

Can one SIM connect several vending machines?

Yes, with a 4G router. In a micro market or a bank of machines, one router and one multi-network SIM can connect every device that supports Ethernet or Wi-Fi. Check that your payment provider permits a wired or Wi-Fi connection for its readers first.

Get a quote for vending machine SIM cards

Whether you run ten machines or ten thousand, we can quote and confirm compatibility quickly. To get the most accurate quote, send us:

• The number of machines and sites
• The make and model of each card reader, telemeter or smart fridge controller
• Your current SIM supplier and renewal dates, if you have them
• Site postcodes, so we can check coverage

Call 0300 124 6181, email sales@routerstore.com or contact our UK team.