Introduction to Cellular Devices

Particle has a wide variety of cellular devices to suit many applications. There's a handy table at the end to help you device what's the best device for your application, but some explanation is in order first as there are a number of decisions to make!

Form Factor

Boron

The Boron is the 3rd-generation cellular device in a prototyping form factor. It has pins on the bottom that can plug into a solderless breadboard, and is compatible with the Adafruit Feather form-factor to easily add accessories like sensors and displays. You can also plug it into a socket on a custom circuit board.

B Series SoM

The B Series SoM (system-on-a-module) is similar to the Boron in that it is a 3rd-generation cellular device. It plugs into an M.2 NGFF connector on your custom circuit board and is intended for mass production use.

One of the benefits is that many of the extra features on the Boron have been omitted from the SoM, so you can implement a custom solution as necessary. For example, rather than duplicating the buttons and status LED on the SoM, you can put them on an external control panel for your product, or omit them entirely.

¹The PMIC (power management IC) and fuel gauge are used with battery-powered applications. They're omitted from the SoM as they are not needed for externally powered solutions (grid or automotive power, for example). Additionally, you may want to use different models if you are making a solar-powered device, or using a different battery technology or multiple battery pack.

Tracker SoM

The Asset Tracker SoM is a castellated SoM designed to be used with the Tracker One or reflow soldered to your own base board. It has features including:

• Gen 3 hardware platform (nRF52840 MCU)
• Quectel cellular modem
• GNSS (GPS)
• IMU (accelerometer)
• Real-time clock
• Hardware watchdog

Electron

The Electron is the 2nd-generation cellular device in a prototyping form factor. It is designed to easily plug into a solderless breadboard, or can be installed in a socket on your own circuit board.

E Series (SMD)

The E Series module is a 2nd-generation cellular device that is reflow soldered to your custom base board. As the software is fully compatible between the Electron and E Series, you can easily move from prototyping to mass production with the same software.

Cellular Carriers

The Particle SIM supports many carriers around the world. The list of mobile carriers is the complete list, however it's important to note that different Particle SIM cards that support a different set of carriers, which may also vary depending on the device.

• Boron 2G/3G EtherSIM BRN304
• Boron 2G/3G BRN302
• B Series B524 EtherSIM (LTE Cat 1 Europe, Australia, and New Zealand)
• B Series B523 (LTE Cat 1 Europe)
• LTE Cat M1 EtherSIM (Boron LTE, B Series B404, E Series LTE E404, and Electron LTE ELC404)
• LTE Cat M1 (Boron LTE, B Series B402, E Series LTE, and Electron LTE)
• Electron ELC314 and E Series E314 EtherSIM
• Electron 2G (G350), Electron 3G (U260 and U270), and E Series 2G/3G E310

SIM cards

There are two different kinds of SIM cards, depending on the device.

• Nano (4FF) SIM card holder that accepts a physical SIM card
• MFF2 embedded SMD SIM soldered to the device

The MFF2 embedded SIM card is best for harsh conditions as it's more robust than the plastic card and connector. It is not a programmed eSIM, however. It's basically the same as the Particle SIM card, except in an SMD form-factor. It cannot be reprogrammed to support other carriers.

The Boron has both a MFF2 Particle SIM soldered to the board and an empty nano SIM card holder that can be used for 3rd-party SIM cards.

Roaming

Non-LTE Particle SIM cards support world-wide roaming. However there may be limitations based on the radio on the device.

¹The Boron LTE can be used with a 3rd-party SIM card in areas outside of the United States, Canada, and Mexico at this time. This is not officially supported, but has been known to work.

²The Electron 2G cannot be used in locations that no longer have 2G service. Some countries include: Australia, Japan, Korea, Singapore, and Taiwan. In the United States, 2G services is only available on T-Mobile, and only through the end of 2020. In some other countries, including Switzerland and New Zealand, the Electron 2G can only be used with a 3rd-party SIM card, not with the included Particle SIM card.

³The U260 model supports 850/1900 MHz for both 3G (UMTS/HSPA) and 2G (GPRS/EDGE). These are the frequencies typically used in the Americas, but there are exceptions.

For example, in Australia, we recommend the U260 because the carrier used by the Particle SIM, Telstra uses 850 MHz. However, if you are using a 3rd-party SIM from Optus, you'll need the U270 because Optus uses 900/2100 MHz.

In New Zealand, we previously recommended the U270 as Two Degrees was the carrier. We've switched to Spark, however, which uses 850 MHz and thus the U260 is now recommended for New Zealand, like Australia. If you've purchased a U270 for use in New Zealand and are stuck at blinking green (connecting to cellular), technical support can switch your SIM back to Two Degrees so you can use the U270.

In Uruguay, the carrier used by the Particle SIM, Movistar, uses 1900 MHz so the U260 Americas model is the correct one. If you're using an Antel 3rd-party SIM, however, that uses 2100 MHz you you'll nee the U270 model, instead.

⁴The U270 model supports 900/2100 MHz for 3G (UMTS/HSPA) and 900/1800 MHz for 2G (GPRS/EDGE). It is typically used in Europe, Asia, and Africa. It is used by some carriers in South America (with a 3rd-party SIM card).

⁵The B Series B402, E Series LTE, and Electron LTE cannot be used outside of the United States, Canada, and Mexico at this time.

⁶For LTE Cat M1 bands, see LTE Cat M1 below.

⁷The Quectel EG91-E modem supports European LTE bands (700, 700, 900, 1800, 2100, and 2600), as well as HSPA/WCDMA 3G (900, 2100) and GSM 2G (900, 1800). See the datasheet for more information.

3rd-party SIM cards

Some Particle devices are compatible with 3rd-party SIM cards.

There are limitations on using 3rd-party SIM cards in large product deployments. If you think you will need to use a 3rd-party SIM you should contact sales for additional information.

4G LTE

There are three main varieties of LTE service:

• LTE Cat 1 is what's used by your mobile phone, and the B Series B524/B523 SoM. It's different than the IoT variation (LTE Cat M1).
• LTE Cat M1 is a version of LTE that is used for relatively low data rate, low-cost, and low-power applications. Particle LTE devices like the Boron LTE, E Series LTE (E404/E402), Electron LTE (ELC404/ELC402), and B Series B404/B402 SoM, support LTE Cat M1.
• LTE Cat NB1 ("NB IoT") is a different low-cost and low-power version of LTE, with even lower data rates. While Particle LTE device hardware can support NB1, it is not officially supported at this time.

At this time, Particle is unable to provide worldwide roaming for LTE Cat M1 devices using the Particle SIM and they can only be used in the United States, Canada, and Mexico.

LTE Cat 1 provides greater compatibility with carriers, but is a more expensive module and uses more power.

B Series B523 SoM is LTE Cat 1 with 2G/3G fallback, and is only compatible with European networks at this time. The Quectel EG91-E module on this device also supports 3G and 2G fallback. Note that the EG91-E is too large to fit in the Boron (Adafruit Feather), Electron, or E Series module, so it will only be available in the M.2 SoM form-factor.

The Tracker SoM T523 is also LTE Cat 1 with 2G/3G fallback, with a Quectel EG91-EX module, and will support the EMEAA region when released.

LTE Cat M1

The following devices use LTE Cat M1:

In the United States, Particle devices use LTE Cat M1 on the AT&T network. In all locations that AT&T supports LTE on their own network (not roaming and not a partner carrier), LTE Cat M1 should also be supported.

In Mexico, AT&T Mexico is used for LTE Cat M1.

In Canada, any of Rogers, Telus, or Bell is used for LTE Cat M1.

²The Canadian bands are for all types of LTE. Not all are used for LTE Cat M1. In particular, band 7 (2600 MHz) is only used for LTE Cat 1, not LTE Cat M1.

LTE Cat 1

LTE Cat 1 is most similar to phone LTE, and should work in all areas with LTE phone data coverage, subject to region and carrier compatibility.

The following devices use LTE Cat 1:

The following bands are supported:

Additional countries in the EMEAA region may work with the B524 and T524, but are not officially supported at this time.

2G and 3G Sunset

Carriers around the world periodically shut down older networks to reallocate the frequencies and tower space to new technologies like LTE and 5G.

The list below is not complete; you should check with the carrier in your area to be sure of sunset, decommissioning, or shutdown dates.

United States

AT&T deactivated their 2G network at the end of 2016. Electron 2G devices can only use T-Mobile at this time.

AT&T's 3G shutdown will occur on February 22, 2022. After this occurs, the Electron U260, Electron E313, and E Series E310 will only connect to T-Mobile in the United States.

T-Mobile began to reallocate 3G spectrum in March 2020 so there could be reduced coverage, and will eliminate all 3G coverage by July 1, 2022, leaving only 2G.

T-Mobile will deactivate their 2G network at some point in the future, at which point 2G/3G devices will cease to work in the United States. This was originally scheduled for end of 2022. The new date has not been announced yet.

The Boron 2G/3G only connects to T-Mobile in the United States already (it cannot connect to AT&T using the built-in MFF2 Particle SIM).

In the United States we strongly recommend using LTE Cat M1. AT&T has committed to supporting the LTE network at least through the end of 2027.

Europe

In some European countries, they're phasing out 3G and instead keeping 2G and LTE networks. All of the Particle 3G cellular devices can also connect to 2G networks, so compatibility will be maintained.

For example, in Norway, Telenor shut down their 3G network at the end of 2020, but keeping their 2G network running until the end of 2025. In Germany, Telekom shut down their 3G network June 30, 2021 but will also keep 2G until end of 2025.

Australia

In Australia, there is no longer 2G service on any carrier and the Electron 2G cannot be used.

The Electron and E Series use Telstra in Australia. They intend to shut down their 3G network at mid 2024. At that point, the Electron can only be used with a 3rd-party SIM card and the E Series will no longer work.

The Boron 2G/3G uses Vodafone in Australia. They have not announced a 3G shutdown date.

¹Can use only with a 3rd-party SIM card.

The B Series SoM B524 and Tracker SoM T524 are officially supported in Australia and New Zealand and provide LTE Cat 1 support with 3G fallback.

Canada

The Electron and E Series use Rogers in Canada:

• 2G service on Rogers will end at the end of 2020. The Electron 2G will no longer operate after that date with the Particle SIM card. Since Bell Mobility and Tellus also will have decommissioned their 2G networks by then, there are few alternatives for 2G service in Canada.
• 3G service on Rogers will end at the end of 2025.

The Boron 2G/3G uses Telus in Canada:

• 2G services on Telus has already ended.
• 3G service on Telus will end at the end of 2025.

By the end of 2025, Rogers, Telus, and Bell will have ended all 2G and 3G service, at which point the 2G/3G SKUs will no longer be able to connect. The LTE Cat M1 SKUs are recommended for use in North America for this reason.

Limited 2G

These countries cannot use 2G (Electron 2G) with the included Particle SIM card. They can only use a 3rd-party SIM card:

• New Zealand
• Switzerland

These countries have a scheduled end to 2G service when using the Particle SIM card:

No 2G

These countries cannot use the Electron 2G at all:

• Australia
• Japan
• Korea
• Singapore
• Taiwan

Does this device work in this country?

This is a harder question to answer than you might think, as there are a number of factors.

Are you an enterprise customer?

If you are an enterprise customer, or plan to be one in the future, you will likely want to take a conservative approach and use only the Particle recommended SKUs for regions and avoid the devices that are NRND (not recommended for new designs).

The Carrier List by Region is a good place to start. In this section you can find the recommended models.

If you need compatibility in two different countries, you can also find that information here. For example, if you need to work both the United States and in the United Kingdom you will likely need two different SKUs, and this page shows which ones you should use.

If you are an individual developer or hobbyist, you may be able to use some devices that would not be recommended for enterprise, as detailed below.

Radio compatibility

The cellular modems all support a specific set of bands. The bands used vary by country, carrier, and technology (2G, 3G, LTE Cat 1, LTE Cat M1). There is currently no truly global SKU that supports all bands and all technologies.

While the Boron 2G/3G (BRN314 and BRN310) and E Series (E314 and E310) are global 2G/3G, they do not support LTE Cat M1. This can be an issue in the United States, where 2G and 3G service will end after 2022, at which point 2G/3G SKUs will no longer work in the United States. This is why the LTE Cat M1 variations (Boron BRN404 and BRN402, E Series E404 and E402) are recommended in the United States.

The B Series SoM (B524, B523) and Tracker SoM (T524, T523, ONE524, ONE523) offer LTE Cat 1, 3G, and 2G, however the cellular modem (EG91-E or EG91-EX) only support the frequencies used in the EMEAA (Europe, Middle East, Africa, and Asia) region. These devices will not work at all in the United States, however there are different SKUs for the United States, Canada, and Mexico (B404, B402, T404, T402, ONE404, ONE402).

Also note that the LTE Cat 1 EtherSIM models (B524, T524, ONE524) are only officially supported (for enterprise use) in Europe, Australia, and New Zealand. The earlier models (B523, T523, and ONE523) are only officially supported in Europe. However, for individual developers, you will likely be able to use these devices in much of the EMEAA region, subject to the remaining constraints below.

Carrier and band compatibility

Additionally, the variation of the Particle SIM in a device will determine which carriers are supported. In general, particularly in Europe, the EtherSIM variations (B524, BRN314) will offer many more carriers than the earlier versions (B523, BRN310).

If you know the device you are interested in and the country, you can find detailed carrier information on the country details page.

For example, the B524 country details page for Germany shows the details including which cellular bands are supported by which carriers. From this table you can see that Telekom uses bands B32 and B38, however the EG91-E cellular modem does not support these bands. However, there are many other bands supported, both on Telekom and other carriers, so coverage will likely be good.

For comparison, using the B524 in Brazil is not recommended. The reason is that 850 MHz (band B5) is commonly used to provide service in rural areas because the signals travel a longer distance. The higher frequencies (1800, 2100, and 2600 MHz) are more commonly used in urban areas, thus it is likely that the B524 will not work in many areas of Brazil.

Likewise, even though Japan is part of the EMEAA region, the B524 in Japan is not recommended because so many of the bands used in Japan are not supported by the EG91-E.

In the United States, LTE Cat M1 EtherSIM devices (Boron BRN404, B Series B404, Tracker T404 and ONE404, E Series E404, Electron ELC404) are a special case. The country details for the United States do not list T-Mobile as supported. The reason is that T-Mobile officially only supports LTE Cat NB1, which is different and not supported by Particle devices. However, many areas of the United States have unofficial T-Mobile LTE Cat M1 service, not advertised by T-Mobile. EtherSIM LTE Cat M1 devices will connect to T-Mobile or AT&T, whichever has a stronger signal. (Pre-2021 LTE Cat M1 devices cannot connect to T-Mobile at all with the built-in Particle SIM on those devices.)

Third-party SIMs

Some devices, most notably the Boron, allow the use of a third-party SIM card. See 3rd-party SIM cards for a full list. Third-party SIM cards are not recommended for enterprise use. Additionally, once you exceed the limits of the free plan, the price based on devices and data operations is the same whether you are using the Particle SIM or a 3rd-party SIM, so it's often not cost-effective.

There may also be issues with certification and carrier approval as described below.

Certification

Some countries may require certification that has not been completed for all Particle devices.

For example, since the LTE Cat M1 devices are intended for use in North America only, they only have FCC (United States) and IC (Canada) certification. While they may work in limited circumstances in Europe, they have not undergone EU certification.

The B524, T524, ONE524, etc. have all undergone EU certification as they are intended for use in Europe, however they are not certified for the US and Canada. Also they will not work, because of band compatibility.

There may also be country-specific certifications that may not have been completed, for example SK in South Korea and MIC in Japan. There are others. A full list of certifications is available on the certifications page.

In addition to the Particle device being certified, the cellular modem may not be certified in some countries. For example, the EG91-E and EG91-EX were not certified by Quetel for use in China, because other modem models are recommended for use in China, as there are also band compatibility issues with the EG91.

Permanent roaming

All Particle SIM devices are considered to be roaming from the local operator's point-of-view. In some countries, local carriers may ban devices that are believed to be permanently roaming. This can happen without notice and the time limit may vary.

The following countries are at risk for permanent roaming restrictions:

• Brazil
• China
• India
• Russia
• Singapore
• Turkey
• UAE

You may be able to connect temporarily, for example doing setup of new devices to be used elsewhere. However you should not use devices regularly in these countries as the devices will likely be blocked and will then be unusable. Growth or enterprise deployments must not be made in areas with roaming restrictions.

Carrier certification

This is mainly an issue with LTE Cat M1 devices in the United States. Both AT&T and Verizon require device manufacturers to test and obtain a certification for their devices to connect to their LTE Cat M1 networks. Particle has completed this process for AT&T, which then involves Particle uploading the IMEI numbers for all certified devices to AT&T so they will not be blocked from the network.

Since Particle SIMs do not have support for Verizon, this process has not been completed for Verizon. The requirement for carrier certification and IMEI registration still applies, however, so if you are using a Verizon SIM or a 3rd-party SIM that supports Verizon (such as Hologram) you will still be banned from the Verizon LTE Cat M1 network, typically after a few days of use.

IMEI registration

Some countries may have a requirement to register the IMEI of mobile devices, including both mobile phones and IoT devices. For example, Turkey and Indonesia. This may be waived for roaming devices (such as Particle devices), or it may apply to all devices, depending on the country.

LTE Cat M1 outside of the North America

In addition to the other requirements, LTE Cat M1 devices may require additional software configuration of the cellular modem.

The SARA-R410M cellular modem in the Boron LTE (BRN404) is configured for North American frequencies only. When used outside of this region, you may need to set the mobile network operator profile (AT+UMNOPROF) and/or specific band support (particularly in Europe) in order to connect.

2G/3G Sunset

Certain countries and carriers are phasing out 2G and 3G service. This is a particularly immediate concern in the United States, which will no longer have any 2G or 3G service after 2022.

The section 2G and 3G sunset, above, has more details.

Summary

¹ MFF2 SMD Particle SIM card. It's soldered to the board and is not reprogrammable.