LTE device connectivity: IoT categories explained

Use the links below to jump to what you need:‍

What is LTE, and how does it differ from 3G?

What IoT standards fall under LTE?

Differences between LTE IoT device categories

Considerations when choosing an LTE IoT device category

FAQs

Recommended reading: What is cellular IoT?

What is LTE, and how does it differ from 3G?

LTE (Long Term Evolution) is the 4G wireless broadband standard that delivers up to 10x faster speeds, lower latency, and better power efficiency than 3G networks. It's also software-defined, allowing carriers to upgrade infrastructure for IoT-specific standards like LTE-M and NB-IoT. Here's what sets it apart:

• Increased speed: 4G can be up to 10 times faster than 3G networks with theoretical 50 Mbps upload and 150 Mbps download speeds.
• Lower latency: LTE offers much lower latency than 3G, meaning fewer network delays or lag times.
• Better power efficiency: LTE uses less power than 3G networks.
• Improved indoor coverage: LTE provides better signal penetration than 3G.
• Flexible and upgradable: LTE networks use software-defined radios, allowing carriers to install upgrades that support new IoT-specific standards like LTE-M and NB-IoT. While carriers use LTE primarily for consumer needs, they carve out spectrum for dedicated IoT applications.
• Higher adoption rates: When it comes to adoption, LTE is widely deployed and serves as the de facto standard for cellular communications in the U.S. and most of the world. In fact, in the U.S., carriers have already shut down their 3G networks as they shifted their focus to building 5G networks.

3G network subscriptions are declining rapidly in regions like the Middle East, Africa, Southeast Asia, Latin America, and Central and Eastern Europe. 2G and 3G sunsetting is accelerating worldwide as carriers migrate subscribers to LTE and 5G. 3G may serve as a fallback option for IoT fleet operators but won't be the primary connectivity method going forward.

‍What IoT standards fall under LTE?

The 3rd Generation Partnership Project (3GPP) standards organization has developed two new IoT-specific standards for LTE networks, in addition to two earlier standards that have widespread coverage worldwide and are also excellent options for IoT applications. These four IoT standards are:

• LTE-M / Cat-M1
• NB-IoT / Cat-NB1
• Cat-1
• Cat-4

Differences between LTE IoT device categories

Let’s take a closer look at each of these four standards and how they differ from one another.‍

LTE-M / Cat-M1

LTE-M (Cat-M1) is a low-power, wide area network(LPWAN) technology designed for IoT devices with low-bandwidth needs. Created as part of 3GPP Release 13, it operates on licensed spectrum as an alternative to unlicensed IoT connectivity technologies (https://www.hologram.io/blog/iot-connectivity-technologies/) like SigFox, LoRa, and RPMA.

Key specs:

• 1 Mbps upload and download speeds
• 10-15 millisecond latency
• Supports cellular tower handoffs

These capabilities make LTE-M ideal for mobile applications like asset trackingand fleet management, and a strong replacement for legacy 2G/3G deployments.

NB-IoT / Cat-NB1

NB-IoT (Cat-NB1), also part of 3GPP Release 13, is a low-cost LPWAN technology designed for IoT devices with minimal bandwidth needs. It provides excellent in-building coverage, low power consumption, and extended battery life.

Key specs:

• 66 kbps uplink / 26 kbps downlink (half-duplex)
• 1.6-10 second latency

NB-IoT is best suited for simple devices requiring small, intermittent data transmissions where latency isn't critical. Ideal use cases include:

• Smart gas, water, and electricity meters
• Smart city applications (street lighting, parking sensors)
• Remote sensing (HVAC control, industrial monitors, smart agriculture

Cat-1

Cat-1 is designed for IoT devices with low and medium bandwidth needs. It's part of Release 8 of the 3GPP standard, so it's an older but still current technology that's widely available around the world. Cat-1 offers bandwidth speeds of 5 Mbps for uploads and 10 Mbps for downloads with a latency of 50 to 100 milliseconds. It uses up to 20 MHz of bandwidth in full-duplex mode and supports tower handoff. As a result, it's a good choice for use cases like wearables, point-of-sale (POS) terminals, ATMs, asset trackers, and smart meters.

Cat-4

While Cat-1 isn't fast enough to support the needs of autonomous vehicles, the Cat-4 LTE standard can meet that demand. It reaches 50 Mbps upload and 150 Mbps download speeds and can better handle video surveillanceand other real-time video applications as well as in-car hotspots and in-car infotainment.

Considerations when choosing an LTE IoT device category

The four LTE IoT categories have overlapping features and performance metrics. The best choice for your company depends on particulars like the amount of throughput you need, latency requirements, power consumption, battery life, cost, and how widespread its adoption is by carriers. Here's a closer look at each of these considerations.‍

Throughput and latency

Cat-M1 targets IoT applications that need more frequent data transfer and lower latency than what NB-IoT offers (although these are much less than other LTE categories, such as Cat-1). Cat-1 networks can handle from low to medium-bandwidth applications, from 100 Kbps to a few 100 Mbps of data per month. Cat-4, on the other hand, can manage much higher upload and download speeds, making it the best choice for high-demand applications such as video.

Power consumption and battery life

As LPWAN technologies, both NB-IoT and LTE-M are designed to conserve battery power. Cat-M1 also supports full and half-duplexing, meaning companies can lower power consumption and increase their battery life by choosing half-duplex. By contrast, Cat-1 consumes more power and has a slightly shorter signal range than NB-IoT and Cat-M1, and Cat-4 consumes the most power and therefore is best suited to use cases with dedicated, connected power sources (rather than batteries), such as autonomous vehicles.‍

Cost

LTE-M and NB-IoT are both designed to be low-cost IoT technologies, making them great choices for many high-volume device applications. Typically, Cat-1 modules cost a bit more than LTE-M and NB-IoT modules, but are only about half the cost of Cat-4 modules.

Carrier adoption and coverage

Cat-M1 and NB-IoT are the leading options for companies upgrading from 3G as carriers sunset legacy networks. These technologies have surpassed one billion connections as of early 2026, with LPWAN connections continuing to grow at a 26% compound annual growth rate, a trajectory aligned with broader cellular IoT trends accelerating adoption worldwide.

Carriers across North America, Europe, and Asia are adopting one or both standards. In the U.S., major providers launched nationwide Cat-M1 networks in 2017 and rolled out NB-IoT in 2019.

4G LTE provides the bandwidth, reliability, and security that IoT deployments demand. Understanding the differences between LTE device categories helps you choose the right fit for your requirements, whether that's low-power sensing or high-bandwidth video. surgery in healthcare and remote management of hazardous machinery. ‍

FAQs

What does LTE connectivity mean?

LTE (Long Term Evolution) is a 4G wireless broadband technology that delivers high-speed data, low latency, and reliable cellular connectivity up to 10 times faster than 3G networks.

What does LTE mean instead of Wi-Fi?

LTE is a cellular network technology that provides internet connectivity through mobile carriers, while Wi-Fi uses local wireless routers. LTE enables devices to connect anywhere with cellular coverage, whereas Wi-Fi requires proximity to a specific access point.

Should your phone be on LTE?

LTE provides faster speeds and better performance for HD video, video calls, maps, and data-heavy apps compared to 3G. While 5G offers even faster speeds where available, LTE still provides the widest coverage across most regions.

What are the main LTE IoT device categories?

The four main LTE IoT categories are LTE-M (Cat-M1) for asset tracking, NB-IoT (Cat-NB1) for smart meters, Cat-1 for wearables and POS systems, and Cat-4 for video surveillance and autonomous vehicles. Each category offers different speed, latency, and power consumption characteristics.