Do EV Chargers and Trackers Need an SMS IoT SIM? (2026 UK Guide)

A tracker goes quiet in a stolen van. The platform can't reach it. One text message can wake it up and ask, "Where are you?" But only if the SIM inside can receive SMS.

That is the whole question in one moment. Most EV chargers and GPS trackers talk using mobile data. Some also need SMS to get set up, woken up or rescued. Pick the wrong SIM and you find out on site, with an engineer standing next to a box that won't answer.

This guide explains, in plain English, when an SMS IoT SIM is essential and when a data-only SIM is enough. It is written for UK charge point installers, tracker installers and fleet managers.

👉 Short on time? See GleeSim's SMS-enabled EE IoT SIM: 500MB, plug and play, from £2.50/month + VAT.

What Is an SMS IoT SIM?

An SMS IoT SIM is a machine SIM card that carries mobile data and can also send and receive text messages. Data carries the device's everyday reports to its cloud platform. SMS carries tiny commands and alerts, such as "connect now", "set this APN" or "send your location". A data-only SIM does the first job but cannot do the second.

Think of it like a house:

• Mobile data is the conversation. Long, detailed, always going back and forth.
• SMS is the doorbell. Short. One ring. It gets the device's attention when the conversation has stopped.

Your device only uses the doorbell if its maker built it to listen for one. That is why the device decides, not the SIM.

Do EV Chargers Need SMS?

Most smart EV chargers do their main job over mobile data, not SMS. They talk to the charge point management system (CPMS) using OCPP (Open Charge Point Protocol). OCPP runs over an internet connection, so day-to-day status, sessions and remote control all travel as data.

So why do so many charger SIMs include SMS? Three real reasons:

1. Wake-up after a dropout. If a charger loses its data session, it can't hear the CPMS. Some chargers and platforms send a text to tell the charger to reconnect. Engineers call this an SMS "shoulder tap".
2. Commissioning by text. Some charger brands let installers set the APN, server address or charger ID by SMS during install. No laptop. No site re-visit.
3. Backup alerts. Some units text a fault alert to a nominated number when the data link is down.

Why this matters in 2026: under the Public Charge Point Regulations 2023, rapid charge points on the public network must hit 99% reliability. A charger that can't be reached counts against you. An SMS wake-up is a cheap way to bring a stuck unit back without sending a van.

Rule of thumb: if your charger's manual mentions SMS wake-up, SMS commands or SMS alerts, buy SMS. If it only lists an APN and a CPMS URL, data-only may be enough. If you are not sure, SMS-enabled costs pennies more than a wasted site visit.

Want the full picture on charger connectivity? Start with our EV charger SIM card guide, then size your data with How Much Data Does an EV Charger Use?

Do GPS Vehicle Trackers Need SMS?

Many do, especially on install day. A large share of GPS trackers are set up by text message. The installer sends short SMS commands to set the APN, the server IP and port, and the reporting interval. Without SMS, many budget and mid-range trackers can't be configured in the field at all.

After install, SMS is still useful:

• Location on demand. Text the tracker and it texts back its position. Handy when the platform shows the vehicle "offline".
• Remote reboot. A stuck tracker can often be restarted with a single command.
• Theft and tamper alerts. Many trackers text an owner or control room when power is cut or the vehicle moves out of hours.

Well-known brands such as Teltonika publish SMS command lists for their trackers. Always use the commands from your device's own manual.

When data-only works: some trackers ship pre-configured and only ever talk to their platform over data. If the supplier confirms that, and you never need SMS location or reboot, a data-only SIM can do the job.

One more check: UK networks have switched off 3G. If an older tracker is 2G/3G only, it may struggle long term. Choose 4G (LTE) trackers for new fleets.

GleeSim supplies the tracker data SIM only, not the tracker unit. We work directly with tracker installers and OEMs, from one SIM for a single scooter to hundreds for a fleet.

SMS vs Data-Only vs Fixed IP SIM: Which One Fits?

	SMS IoT SIM	Data-only IoT SIM	Fixed IP SIM
What it does	Data + text commands and alerts	Data only	Data with a permanent, reachable IP address
Best for	Trackers set up by SMS; chargers with SMS wake-up	Pre-configured devices that only talk to the cloud	CCTV, routers and devices you must reach directly
Rescue a stuck device remotely?	Yes, by SMS (if the device supports it)	Only if the data link is still up	Yes, if the data link is up
Field setup by text?	Yes	No	Only if SMS is also on the plan
Risk if you pick it wrongly	Very low: small extra feature	Device can't be configured or woken	Paying for an IP you don't need
GleeSim option	EE IoT SIM 500MB, SMS-enabled	Ask for a bespoke quote	Fixed IP SIMs

Quotable: "Data is the conversation. SMS is the doorbell. If your device can't hear the doorbell, it can't be woken up."

Need direct remote access as well as SMS? See why remote devices need a fixed IP.

What Does the Wrong SIM Actually Cost You?

The SIM is the cheapest part of the job. The site visit is not.

A full year of GleeSim's EE IoT SIM on the 3-month plan is about £35 + VAT. A single engineer visit to reset or reconfigure one charger or tracker almost always costs more than that. Multiply it across 50 chargers or 200 vans and the wrong SIM becomes a budget line.

Ready to stop paying for avoidable site visits? Order the SMS-enabled EE IoT SIM or, for 20+ SIMs, request a bespoke fleet quote →

The 6-Point SMS IoT SIM Checklist

Save this before your next install.

1. Read the device manual for "SMS". Look for SMS commands, SMS wake-up or SMS alerts. If any appear, buy SMS-enabled.
2. Check which way the texts go. Does the device receive commands, send alerts, or both? Confirm the plan supports that direction.
3. Check the network at the real install spot. Car parks, basements and rural lay-bys behave differently. GleeSim can check local mast coverage and recommend the strongest network.
4. Size the data separately. SMS doesn't replace data. Use our GPS tracker data guide or EV charger data guide.
5. Confirm APN setup. The GleeSim EE IoT SIM needs no APN configuration, which removes a common install failure.
6. Pilot before you scale. Test registration, data, an SMS command and recovery after a power cut on 1–5 units before rolling out to the fleet.

GleeSim's SMS-Enabled EE IoT SIM

Spec	Detail
Network	EE (UK)
Data	500MB per month
SMS	Enabled
Setup	Plug and play, no APN configuration required
Plans	3-month or 24-month
Price	£2.90/month + VAT (3-month) · £2.50/month + VAT (24-month)
Fleets	Bespoke pricing for 20+ SIMs

When to choose something else: if your chargers sit underground or your vans cross rural blackspots, a multi-network IoT SIM can switch between UK networks. If you need to reach a device directly, add a fixed IP.

Why UK businesses buy IoT connectivity from GleeSim

GleeSim is a boutique UK telecom company based in Livingston, Scotland. The GleeSim family started in 2009, and the team brings 30 years' combined telecoms experience.

We design bespoke connectivity for SMEs, corporates and enterprises:

• M2M and IoT SIMs for EV chargers, trackers, meters, CCTV and sensors
• Mobile broadband (MBB) and 4G/5G routers for sites, vans and offices
• Business mobile contracts with or without handsets
• Fixed IP SIMs for secure remote access
• With or without hardware: SIM-only, or SIM plus router, configured for you

You talk to a UK team that understands OCPP, tracker setup and network coverage, not a ticket queue. For larger rollouts, see our corporate and enterprise service or how we connect electric fleets' chargers, trackers and phones under one supplier.

Who Uses SMS IoT SIMs?

• Charge point operators and installers: SMS wake-up keeps public chargers reachable and closer to reliability targets.
• Councils, hotels and universities: destination chargers that must stay online without a full-time engineer.
• Tracker installers and OEMs: configure every unit by text on install day.
• Fleet and logistics managers: location-on-demand and remote reboot when a van goes "offline".
• Moped, scooter and motorcycle owners: theft alerts and SMS location when it matters most.

FAQ: SMS IoT SIMs for EV Chargers and Trackers

Do EV chargers need an SMS-enabled SIM?

Not always. Most smart chargers send their everyday data over OCPP using mobile data. You need SMS when the charger uses text for wake-up, commissioning or alerts. Check the manual, and if in doubt choose SMS-enabled, as it costs little and can save a site visit.

Does a GPS tracker need an SMS SIM?

Many do. Lots of trackers are configured by SMS commands that set the APN and server address on install day. SMS also enables location-on-demand and remote reboot. Pre-configured, data-only trackers can work without it.

What is the difference between an SMS IoT SIM and a data-only SIM?

An SMS IoT SIM carries mobile data and can send and receive text messages. A data-only SIM carries data but no texts. SMS is useful for setup and rescue commands; data carries everyday reporting.

Can an EV charger use SMS instead of mobile data?

No. OCPP, charging sessions, payments and firmware updates need a data connection. SMS only supports small extras such as wake-up commands or alerts.

Do I need to set an APN on the GleeSim EE IoT SIM?

No. The GleeSim EE IoT SIM is plug and play with no APN configuration required. Your device should still support the EE network and the SIM size it uses.

Can I get SMS IoT SIMs for a whole fleet?

Yes. GleeSim supplies from one SIM to hundreds, and offers bespoke pricing for 20 or more SIMs. Contact the UK team for a fleet quote, multi-network options or fixed IP.

Data does the talking. SMS rings the doorbell. If your charger or tracker uses text commands, wake-ups or alerts, an SMS IoT SIM is not optional. It is the difference between fixing a device from your desk and driving to it.

Check the manual. Check coverage. Pilot a few units. Then roll out with confidence.

Get your fleet connected properly first time. GleeSim's SMS-enabled EE IoT SIM: 500MB, plug and play, from £2.50/month + VAT, backed by a UK team in Scotland.

👉 Order the EE SMS IoT SIM · Get a bespoke quote for 20+ SIMs · Browse tracker and EV charger SIMs