What SIM Does a 4G Data Logger Need in Australia?

A data logger needs a SIM service that matches the cellular modem used by the logger or its external telemetry modem. A compatible standard 4G LTE logger, including LTE Cat 1 equipment, may use a standard mobile data SIM. LTE-M (Cat-M1) and NB-IoT-only devices require different connectivity.

Before choosing a SIM or data allowance, identify the cellular technology used by the exact logger or modem model.

How does a cellular data logger connect?

A remote monitoring system can be represented as:

Sensor → Data Logger → Cellular Modem → SIM → Mobile Network → Internet → Cloud or Server

The sensor measures something such as water level, temperature, pressure, rainfall or equipment status. The logger records those measurements, and its cellular modem uses the SIM to send the data to a monitoring platform, manufacturer's cloud or another server.

The SIM provides the mobile connection. It does not replace the logger, sensors or monitoring platform.

Step 1: identify the cellular technology

The words “4G” or “LTE” in a product name are not enough to establish SIM compatibility. Check the modem specification for the exact cellular technology used by the device.

Standard 4G LTE and LTE Cat 1

LTE Cat 1 is a category within standard 4G LTE and is used by industrial cellular equipment and data logging systems. A compatible Cat 1 device with suitable Australian LTE bands and a physical SIM slot may use a standard mobile data service.

LTE-M / Cat-M1

LTE-M, also called LTE Cat-M1, is a low-power cellular technology used by some IoT and monitoring devices. An LTE-M-only device should not be treated as a standard LTE logger when choosing connectivity.

NB-IoT

NB-IoT is another low-power cellular technology used by some sensors and telemetry equipment. An NB-IoT-only device requires a service that supports that technology.

Lemon Mobile's Data Logger SIM is intended for compatible standard 4G LTE equipment, including LTE Cat 1. LTE-M and NB-IoT-only devices are not supported.

Why the words “4G data logger” are not enough

Two products described as 4G data loggers can use different cellular technologies internally.

For example, the Campbell Scientific CELL220 for Australia and New Zealand uses LTE Cat 1. By contrast, the Aqualab A760 is marketed as 4G/LTE telemetry equipment but its published cellular specification identifies LTE Cat-M1/NB1.

The practical rule is simple: check the modem technology, not just the product name.

Step 2: check the SIM slot and LTE bands

Confirm that the logger or modem accepts a physical SIM and check the SIM size required by the exact device.

Then check the LTE bands supported by that modem version. A SIM fitting physically into the device does not by itself establish network compatibility.

Data logger SIM compatibility at a glance

Device specification	Lemon Mobile Data Logger SIM
Standard 4G LTE	Potentially suitable — check LTE bands and device requirements
LTE Cat 1	Potentially suitable — check LTE bands and device requirements
LTE-M / Cat-M1 only	Not supported
NB-IoT only	Not supported
2G / 3G only	Not supported
SMS or voice required for normal operation	Not suitable
Physical SIM + standard LTE data connectivity	Strong candidate — check exact modem specification

Do RS-485, Modbus, SDI-12 or 4–20mA affect SIM compatibility?

No. These interfaces operate between sensors, instruments and the data logger. They do not determine which cellular technology the logger uses.

• A water-level sensor may connect using SDI-12
• An industrial meter may communicate using RS-485 and Modbus
• A pressure or level sensor may provide a 4–20mA signal
• The logger then sends the recorded measurements through its cellular modem

SIM compatibility is determined by the cellular modem, not by the sensor interface.

What can a cellular data logger send over mobile data?

A cellular logger can use its mobile data connection to send telemetry using technologies such as HTTP/HTTPS, MQTT, FTP, email, JSON messages, a manufacturer's cloud platform or another supported internet-based protocol.

SMS is different. If a device depends on traditional SMS for alarms, commands or normal operation, a data-only SIM will not provide those SMS functions.

How much mobile data does a data logger use?

There is no single monthly figure that applies to every data logger. Usage depends on:

• Number of sensors and channels
• Payload size
• Logging interval
• Upload interval
• Whether measurements are batched
• Protocol overhead
• Connection retries
• Diagnostics and remote access
• Firmware or configuration traffic

A logger sending small numerical measurements can use much less mobile data than a camera or another high-bandwidth device. More frequent uploads, larger payloads and software updates can increase usage.

See the Data Logger SIM Card Australia product page for current data allowances and pricing.

Data logger and telemetry examples

Campbell Scientific CELL220 — standard LTE Cat 1

The Campbell Scientific CELL220 is a 4G LTE Cat 1 cellular module for Australia and New Zealand. Campbell Scientific documents it as accepting a Micro SIM and working with standard cellular data plans.

The CELL220 can provide internet connectivity to Campbell Scientific data loggers including the CR300, CR310, CR6 and CR1000X.

COMET U5841G — LTE Cat 1 with a separate SIM

The COMET U5841G uses an LTE Cat 1 modem. Australian product documentation states that a SIM is not included and reports testing with SIM cards from Australian mobile carriers.

The logger can send measurement data and JSON messages over its 4G data connection. It also has SMS-related functions, so deployments that rely on those functions require a service that provides SMS.

Micro-Diver + Eijkelkamp GDT-S Prime — user-supplied SIM

Aqualab documents the Micro-Diver groundwater logger with an Eijkelkamp GDT-S Prime 4G modem. Its Australian documentation describes a user-supplied SIM being used to transmit water-level data over a 4G internet connection.

Aqualab A760 — why modem specifications matter

The A760 is described as 4G/LTE telemetry equipment for agricultural, meteorological and hydrological monitoring, but its published modem specification identifies LTE Cat-M1/NB1.

This is an example of why a “4G” product description should not be treated as proof of standard LTE compatibility.

Geomotion RIPPA — 4G field telemetry example

The RIPPA is an example of a 4G field data logger used for geotechnical monitoring. Published applications include pore pressure, water level, tilt, displacement, load, rainfall and vibration monitoring.

It is included here as an example of cellular data logging, not as a Lemon Mobile compatibility claim. Check the exact modem and SIM requirements for the model being used.

Where are cellular data loggers used?

• Groundwater and bore monitoring
• Water-level monitoring
• Tank and pump telemetry
• Weather stations and rainfall monitoring
• Environmental monitoring
• Temperature, humidity and CO₂ logging
• Soil and agricultural monitoring
• Geotechnical instrumentation
• Pore pressure, tilt and displacement monitoring
• Structural monitoring
• Energy and utility metering
• Remote industrial equipment

Does your logger require SMS?

Some data loggers and telemetry devices use mobile data for ongoing monitoring but also include SMS-based alarms, commands or other functions.

Lemon Mobile's Data Logger SIM is a data-only service. If SMS or voice is required for the normal operation of your equipment, choose a service that supports those functions.

How to check a data logger before choosing a SIM

1. Find the exact logger and cellular modem model.
2. Identify whether it uses standard LTE, LTE Cat 1, LTE-M or NB-IoT.
3. Check the supported Australian LTE bands.
4. Confirm that it accepts a physical SIM.
5. Check whether SMS or voice is required for normal operation.
6. Estimate monthly data usage from the reporting frequency and payload size.

Frequently asked questions

Can I use a standard data SIM in a data logger?

A compatible standard 4G LTE data logger may use a standard cellular data service where its modem, LTE bands and physical SIM interface are compatible. LTE-M and NB-IoT-only devices require connectivity designed for those technologies.

Is LTE Cat 1 the same as LTE-M?

No. LTE Cat 1 is a category within standard LTE. LTE-M, also called Cat-M1, is a different low-power cellular technology.

Does a data logger need a phone number?

Not when the device communicates entirely through mobile data. A logger that requires traditional SMS or voice functionality needs a service that provides those features.

Does Modbus need a special SIM?

No. Modbus operates between equipment and the logger. SIM requirements are determined by the logger's cellular modem.

Can a data SIM be used for environmental monitoring?

Yes, where the monitoring system uses a compatible standard 4G LTE modem. Applications can include water level, rainfall, temperature, humidity, CO₂, soil and other remote measurements.

What SIM does a Campbell Scientific CELL220 use?

The Australian CELL220 is an LTE Cat 1 cellular module with a 3FF Micro SIM interface. Campbell Scientific states that it works with standard data plans.

Choose connectivity for your data logger

If your logger uses compatible standard 4G LTE connectivity, see our Data Logger SIM Card Australia for current plans and pricing.

Check the cellular specification for your exact model first. If you're still unsure about compatibility, contact us before ordering.

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