Cellular IoT: Weighing Cost, Battery Life, and Data Use

While the Internet of Things (IoT) spans many radio technologies, cellular networks remain a popular choice for connecting devices in the field. This article evaluates whether cellular IoT is the right fit for your project by examining coverage, battery life, data usage, and cost compared to low‑power wide‑area (LPWA) alternatives.

Key Elements of Cellular IoT

Infrastructure

One of the most cited advantages of cellular IoT is its ubiquity. In the United States, major carriers cover roughly 99% of the population, making it easy to deploy a sensor network “at the drop of a hat.” LPWA networks, by contrast, require installation of gateways and typically serve areas of only a few square miles. If you’re building a campus‑wide or farm‑scale system, a small number of LPWA gateways may suffice, which can diminish the need for nationwide coverage.

Battery Life

Early 2G cellular modules used a store‑and‑forward architecture that allowed devices to wake, transmit, and return to sleep—great for preserving battery. Subsequent 3G/4G releases adopted an always‑on model, keeping the radio listening for incoming messages, which dramatically increases power consumption. Modern LPWA protocols (LoRaWAN, Sigfox, NB‑IoT) keep radios asleep most of the time, enabling batteries to last 5–10 years, depending on the technology and usage pattern.

Recognizing this gap, carriers introduced LTE‑M (Cat‑M1) in 2017. LTE‑M reintroduces some store‑and‑forward behavior, lowering power draw by roughly 70–80% compared to legacy 4G LTE. However, even LTE‑M still consumes about ten times more power during transmission (≈120 mA vs. 12 mA) and up to a thousand times more in standby (≈2 mA vs. 2 µA) than LPWA solutions.

Data Transmission

LTE and 4G networks offer 44 available frequency bands and high bandwidth, designed for broadband applications like video streaming and VoIP. Most M2M devices, however, transmit only a few hundred bytes per day—far below the gigabyte‑scale data plans carriers sell. Using a full‑blown LTE connection for such light traffic is inefficient, analogous to sending a single shovel of sand on an eight‑lane highway full of trucks.

Cost Considerations

Module Costs

In high volumes, an LTE module costs between $25 and $30, whereas an LPWA module is priced around $10. As LPWA adoption grows, the price per module is expected to drop to $5–$10 within the next three years, offering substantial savings when scaled across thousands or millions of devices.

Recurring Fees

Typical LPWA networks in Europe charge a few dollars per device per year. In contrast, cellular data plans average a few dollars per month, resulting in a much higher total cost when multiplied across a large fleet. Organizations that operate their own LPWA gateways avoid monthly recurring charges entirely.

Miscellaneous Fees

Cellular deployments may incur SIM activation/deactivation fees, over‑age charges, or flat monthly fees regardless of data usage. While some LPWA networks impose similar nominal fees, the overall cost is usually lower, especially for devices with minimal traffic.

Choosing the Right Network

Decide first what type and volume of data you need to transmit. If your application requires high‑bandwidth, real‑time video or voice, cellular may be appropriate. For most sensor and telemetry use cases—sending only a handful of bytes per day—LPWA offers a more efficient, cost‑effective solution. Consider also that cellular and LPWA are not the only options; other M2M standards (e.g., 5G NR‑M, Thread, Zigbee) may better fit niche scenarios. For a deeper comparison, refer to our white paper on the seven most popular M2M networks.