SIM Providers: LTE-M/Nb-IoT + Roaming, and Setup

Updated at April 28th, 2025

Table of Contents

Tracking Specific SIMs Test! Pricing - you get what you pay for Commercial Deployments So what SIMs should I get? What providers are there? Key Points Operating Networks Vodafone SIM users Roaming SIM Cards Roaming SIM Note Our Results/Findings How do I configure any network settings if required?

To get online with our 4G LTE-M/NB-IoT devices, you will require a SIM card that operates on these networks. Often multiple terms are used for the same network - e.g. Cat-M1 and LTE-M are used interchangeably.

Ensure you read Connectivity - LTE-M vs NB-IoT, Coverage, Providers and Roaming as an overview of all the key concepts of LTE-M/NB-IoT.

Tracking Specific SIMs

Our LTE-M/NB-IoT devices will need special SIMs for these networks - i.e. often a standard '4G Prepaid SIM' like you would buy for your mobile phone will not get you online.

Test!

LTE-M and NB-IoT networks are relatively new and are still being rolled out in some places. Teething problems may occur.

They are usually quickly resolved and once a network has been up and running for a while you can expect trouble-free operation. However test new SIMs, networks, and technologies thoroughly before deploying in volume.

Pricing - you get what you pay for

When deploying many devices, even small differences in data costs can quickly rack up.

Often the expensive SIM cards are more reliable and provide better connectivity. Not all SIM cards work the same - some can even reduce device battery life.

Commercial Deployments

Low-cost, relatively unknown roaming SIM cards can be tempting. However certain networks may have agreements with the providers that if a roaming SIM stays attached to their network for too long (e.g.> 6 months continuously) - it can be kicked off.

Any savings on SIM data will quickly evaporate if units need to be recovered and SIMs swapped. This is not to discourage cost-saving measures, lower-priced tracking is great for everyone! However, the risks and benefits should be considered when choosing untested SIMs and networks. Test thoroughly before rolling out large-scale deployments.

So what SIMs should I get? What providers are there?

Key Points

The following list of SIMs and networks is not exhaustive. Plenty of others exist and may well work.
This is not a list of 'approved providers', you're free to use any SIM you choose!
This list relies purely on the feedback from our partners. We have better data in the countries where we are more active/have more devices.
Many of the roaming SIMs will list on their website that they roam to many more countries than are indicated below. We add an entry when we have confirmed the SIM will work in that country.
Things can change quickly. We've had providers who didn't work in the past begin to work after updates from various third parties (networks, SIM providers, component providers).
We recommend you always do your own testing and confirm functionality for your use case.

LTE-M/NB-IoT Networks are still relatively new, but in many countries, coverage is very widespread. Roaming is also relatively new but we have seen many new providers come to market with good results.

See GSM Arena - Mobile IoT Commercial Launches for an up-to-date list of current and announced LTE-M/Nb-IoT networks globally.

When selecting a SIM card check the GSM Arena list, to find what networks operate LTE-M or NB-IoT networks in your country/countries of interest.

The information below can guide you in making your choice.

Operating Networks

Country	Technology	SIM Provider	Results	Network
Australia	LTE-M	M2M One	Excellent - Connects Automatically Recommended Suggested Setup: APN = telstra.m2m 4G Network = Australia: Telstra CAT-M1 Suggested 4G settings	Telstra LTE-M Coverage is widespread. Coverage Map
Australia	LTE-M	Telstra	Excellent - Connects Automatically Suggested Setup: APN = telstra.m2m 4G Network = Australia: Telstra CAT-M1 Suggested 4G settings	Telstra LTE-M Coverage Map
Australia	LTE-M	Emnify Roaming SIM	Can potentially lead to excessive battery drain. See Roaming SIM Cards - Battery Life Impact. And 4G Battery Powered Device Behaviour Effects Suggested Setup: APN = em 4G Network → Custom - m3+7+28 Suggested 4G settings	Telstra LTE-M (roams on network)
Australia	LTE-M	Soracom Roaming SIM	Working well. Connects automatically. Suggested Setup: APN = soracom.io 4G Network → Custom - m3+7+28 Suggested 4G settings Can be purchased via Thinxtra (Soracom's ANZ Distributor)	Telstra LTE-M (roams on network)
Australia	LTE-M	Spark NZ Roaming SIM	Working well - testing is not widespread. An option if devices will travel between AU and NZ.	Telstra LTE-M (roams on network in AUS and to Spark's network in NZ)
Australia	LTE-M	1NCE Roaming SIM	Using this SIM in AU seems to cause issues with the uBlox SARA R410M - avoid for these devices. Working well - No such issues on newer range of devices with Nordic modem - Connects automatically. Suggested Setup: APN = iot.1nce.net 4G Network → Custom - m3+7+28 Suggested 4G settings	Telstra LTE-M (roams on network)
Australia	LTE-M	Twilio Super Roaming SIM	Limited Testing, shown to be working. Feb 23 - Devices initially connected however facing registration issues, recently. Some partners have reported this to Twilio - caution advised. Suggested Setup: APN = super 4G Network → Custom - m3+7+28 Suggested 4G settings	Telstra LTE-M (roams on network)
Australia	LTE-M	Simbase Roaming SIM	Limited Testing - Connects Automatically. Setting APN is Recommended Suggested Setup: APN = simbase 4G Network → Custom - m3+7+28 Caution Advised – Initial testing shows repeated Registration and Upload errors. And IMSI swapping. Which can lead to excessive battery drain. Roaming SIM Cards - Battery Life Impact - Digital Matter	Telstra LTE-M (roams on network)
Australia	NB-IoT	M2MOne	Excellent - Connects Automatically - using these Telstra local SIMs “NB-IoT Type 1” Suggested 4G settings	Telstra NB-IoT Coverage Map
Australia	NB-IoT	M2MOne	Limited testing of eDCP NB-IoT SIMs (this is Telstra's roaming NB-IoT SIM). Got online automatically. Suggested 4G settings	Telstra NB-IoT
Australia	NB-IoT	Optus	Tested by DM in DM Perth office - working well. Standard IoT SIMs Connect automatically with no input. The extent of coverage is not well known. Works great in Urban areas. Suggested 4G settings APN for Standard IoT SIMs: optusiot APN for SIMs with iotflex enabled: iotflex	Optus NB-IoT
Australia	NB-IoT	Vodafone	Initially Vodafone NB-IoT Would not work due to DNS issues as ePCO was not enabled. This is now reportedly enabled - but DNS still does not work. As of 2020, we can work around this using our Provisioning Tool. But aiding data downloads fail - so fixes take longer, reducing battery life on battery-powered devices. DNS Troubleshooting on 4G	Vodafone NB-IoT
Austria	NB-IoT	A1	Proven to work well with our devices in Austria using A1 SIMs	A1
Belgium	NB-IoT	Orange	Coverage is good, DM devices have had a lot of success using Orange NB-IoT SIMs	Orange (roams on network)
Belgium	LTE-M	1NCE Roaming SIM	Coverage is good, DM devices have had success using 1NCE SIMs	1NCE (roams on network)
Belgium	LTE-M	Onomondo Roaming SIM	Good results, gets online automatically - setting the ‘onomondo’ APN is highly recommended.	Proximus (Belgacom) And Orange
Belgium	NB-IoT	Onomondo Roaming SIM	Data Sync issues - caution advised. Gets online automatically - setting the ‘onomondo’ APN is highly recommended.	Orange And BASE (KPN)
Canada	LTE-M	Rogers	Must configure APN to get online. Received from the carrier.	Rogers
Canada	LTE-M	Bell	Must configure APN to get online. Received from the carrier.	Bell
Canada	LTE-M	Telus	Must configure APN to get online. Received from the carrier.	Telus
Canada	LTE-M	Aeris	Good results, recommended roaming SIM.	AT&T
Canada	LTE-M	EMnify Roaming SIM	Good results, gets online automatically but be sure to apply the right configuration once online	Telus (roams on the network)
Canada	LTE-M	1NCE Roaming SIM	APN must be set to "iot.1nce.net"	1NCE (roams on network)
France	LTE-M	1NCE Roaming SIM	Coverage is good, DM devices have had success using 1NCE SIMs	1NCE (roams on network)
France	LTE-M	Onomondo Roaming SIM	Good results, gets online automatically - setting the ‘onomondo’ APN is highly recommended.	Orange (roams on network)
Germany	NB-IoT	1NCE Roaming SIM	Coverage is good, DM devices have had success using 1NCE SIMs	1NCE (roams on network)
Germany	LTE-M	Onomondo Roaming SIM	Good results, gets online automatically - setting the ‘onomondo’ APN is highly recommended.	E-Plus (roams on network)
Hong Kong	NB-IoT	HK Telecom	Issues with DNS but can be worked around using a Wired Provisioning Tool. See DNS Troubleshooting on 4G Suggested Setup: APN - NBIOTDIRECT Custom network string - n8,x	HKT
Hong Kong	NB-IoT	Soracom	Working well. Suggested Setup: APN = soracom.io
Hong Kong	NB-IoT	Orange/Three Three Mobile	Issues with DNS but can be worked around using a Wired Provisioning Tool. See DNS Troubleshooting on 4G	Three
Hong Kong	NB-IoT	China Mobile	Issues with DNS but can be worked around using a Wired Provisioning Tool See DNS Troubleshooting on 4G Suggested Setup: APN - nbiot Custom network string - n3+8,x	China Mobile
Hungary	LTE-M	Onomondo Roaming SIM	Good results, gets online automatically - setting the ‘onomondo’ APN is highly recommended.	Vodafone
Hungary	NB-IoT	Onomondo Roaming SIM	Intermittent Connection issues - caution advised. Gets online automatically - setting the ‘onomondo’ APN is highly recommended.	Telenor (roams on network)
Italy	NB-IoT	1NCE Roaming SIM	Coverage is good, DM devices have had success using 1NCE SIMs	Vodafone
Italy	LTE-M	Onomondo Roaming SIM	Good results, gets online automatically - setting the ‘onomondo’ APN is highly recommended.	Vodafone (roams on network)
Luxembourg	LTE-M	Onomondo Roaming SIM	Data Sync issues - caution advised. Gets online automatically - setting the ‘onomondo’ APN is highly recommended.	Post (roams on network)
Netherlands	LTE-M	1NCE Roaming SIM	Coverage is good, DM devices have had success using 1NCE SIMs	1NCE
Netherlands	LTE-M	Onomondo Roaming SIM	Good results, gets online automatically - setting the ‘onomondo’ APN is highly recommended.	KPN and T-Mobile (Deutsche Telekom) (Roams on networks)
New Zealand	LTE-M	One NZ (Vodafone)	Excellent - Connects Automatically Suggested 4G Settings	One NZ Coverage Map
New Zealand	LTE-M	Spark NZ	Excellent - Connects Automatically Suggested 4G Settings	Spark Coverage Map
New Zealand	NB-IoT	Spark NZ	Excellent - Connects Automatically Suggested 4G Settings	Spark Coverage Map
New Zealand	NB-IoT	One NZ (Vodafone)	Reportedly performing well - but DM have not yet seen significant evidence to support this Suggested 4G Settings	One NZ Coverage Map
New Zealand	LTE-M	Soracom Roaming SIM	Working well. Connects automatically. Suggested Setup: APN = soracom.io 4G Network → Custom - m3+28 Suggested 4G settings Can be purchased via Thinxtra (Soracom's ANZ Distributor)	Spark/One (Roams on both networks)
New Zealand	LTE-M	Hologram Roaming SIM	Set APN to hologram Set bandmasks to m1+3+28 Limited testing, have seen SIMs online with the above settings. Suggested 4G Settings	Spark/One (Roams on both networks)
New Zealand	LTE-M	M2M One (Aus) Roaming SIM	Reportedly working well on the Spark network May 23 - A few partners have reported that these SIMs do not connect - caution advised	Spark
Norway	NB-IoT	Telenor	Proven to work well with our devices in Norway using Telenet SIMs	Telenet
Norway	NB-IoT	COM4	Proven to work well with our devices in Norway using COM4 SIMs	COM4
Norway	LTE-M	1NCE Roaming SIM	Coverage is good, DM devices have had success using 1NCE SIMs APN must be set to "iot.1nce.net"	1NCE (roams on network)
Norway	LTE-M	Emnify Roaming SIM	Proven to work well with our devices in Norway using Emnify SIMs. No APN configuration is needed.	Emnify (roams on network)
Papua New Guinea	LTE-M	Vodafone	Limited tested - have seen a device manage to get online. Further testing required	Vodafone
Papua New Guinea	LTE-M	Digicel	Limited tested - have seen a device manage to get online. Further testing required	Digicel
Portugal	LTE-M	Vodafone	Vodafone global roaming SIM able to connect on LTE-M in Portugal	Vodafone
Portugal	NB-IoT	Vodafone	ePCO does not appear to be enabled on Vodafone Portugal's NB-IoT network, causing DNS issues. This may be able to be worked around by setting the OEM Server IP in parameters ahead of time Further testing is required. DNS Troubleshooting on 4G	Vodafone
Singapore	LTE-M	Singtel	Good results, gets online automatically.	Singtel
Singapore	LTE-M	Soracom Roaming SIM	Good results, gets online automatically.	Singtel (roams on network)
Singapore	LTE-M	Onomondo Roaming SIM	Limited tested - have seen a device manage to get online. Further testing required APN must be set to "onomondo"	Singtel (roams on network)
South Africa	NB-IoT	Vodacom	Must configure APN to get online. APN must be set to "lte.vodacom.za". In some instances, “nbiot.vodacom.za” may work.	Vodacom
Spain	LTE-M	Emnify Roaming SIM	Good results, gets online automatically but be sure to apply the right configuration once online	Orange (roams on network)
Spain	NB-IoT	Vodafone	Global Roaming SIM connects in Spain. Limited Testing	Vodafone
Spain	LTE-M	Vodafone	Untested	Vodafone
Switzerland	NB-IoT	Migros	NB-IoT devices reportedly connecting.
Switzerland	NB-IoT	Hologram Roaming SIM	NB-IoT not yet supported on Hologram. Awaiting further tests.
Switzerland	LTE-M	Onomondo Roaming SIM	Good results, gets online automatically - setting the ‘onomondo’ APN is highly recommended.	Swisscom and Sunrise
Thailand	LTE-M	AIS	Very limited testing has proven successful. Partners should test further before deploying in volume. APN: internet	AIS
Thailand	NB-IoT	AIS	Very limited testing has proven successful, partners should test further before deploying in volume. APN: devkit.nb 4G Network - Global: NB-IoT Only Custom Network Or Bandmasks - n8+28	AIS
United Kingdom	LTE-M	1NCE Roaming SIM	DM devices have had success using 1NCE SIMs APN must be set to "iot.1nce.net"	1NCE (roams on network)
United Kingdom	LTE-M	Onomondo Roaming SIM	Good results, gets online automatically - setting the ‘onomondo’ APN is highly recommended.	O2 (Telefónica)
United States of America	LTE-M	Aeris	Good results, across a large number of devices (recommended roaming card for the US)	AT&T (roams on network)
United States of America	LTE-M	Pod	Good results, Pod supply 'native' AT&T SIMs Must set APN "data641003"	AT&T
United States of America	LTE-M	Emnify Roaming SIM	Gets online automatically but be sure to apply the right configuration once online. Some Emnify SIMs have been seen to swap IMSIs regularly, causing excessive battery drain Roaming SIM Cards - Battery Life Impact	Sprint and AT&T (roams on networks)
United States of America	LTE-M	AT&T	Only certified devices may be used on these networks (Oyster2 and Dart2 currently)	AT&T
United States of America	LTE-M	Verizon	Device IMEI must be added to Verizon database by Digital Matter. Only certified devices may be used on Verizon (Remora2, Oyster2, G62 and Yabby GPS currently). Limitations on how often the device may upload - this is handled by Applying the correct settings for Verizon	Verizon
United States of America	LTE-M	Hologram Roaming SIM	Must configure APN: "hologram" to get online	AT&T (roams on network)
United States of America	LTE-M	Twilio Super Roaming SIM	Setup: APN = super 4G Network - Global: Cat-M1 Only	AT&T (roams on network)
United States of America	LTE-M & NB-IoT	1NCE Roaming SIM	Older generation devices using uBlox modems must have the APN set to "iot.1nce.net" before they can connect. Newer generation devices using Nordic modems (Bolt2, Dart3, G70, Hawk, Oyster3, Oyster Edge, Remora3, Yabby3, Yabby Edge) connects automatically. Best to configure the APN as provided by 1NCE	1NCE (roams on network)
United States of America	LTE-M & NB-IoT	Onomondo Roaming SIM	Good results, gets online automatically - setting the ‘onomondo’ APN is highly recommended.	AT&T (roams on network)
United States of America	LTE-M	Monogoto	Connects automatically. Recommended to configure APN as provided by Monogoto

Vodafone SIM users

For Vodafone SIM customers, in some regions, devices are experiencing connectivity issues. When we View Device Logs Numerous instances of "aborting oneshot data" messages are observed.

Aborting oneshot data means the connection was aborted mid data transfer (i.e. we could get on the network, and connect, but it failed after that).

This is generally due to Firewalls on Vodafone's network.

The user should request to Vodafone:

“Please update the APN access list for the SIM cards with all IP addresses and FQDNs from this article. Please include the US and EU instances to ensure cross-over access at a later stage.”

Roaming SIM Cards

Modem and network updates have led to their performance improving dramatically. Consult the provider's network and country list for full details - but always test!

Roaming SIM Note

Some networks have in their agreements with roaming SIM providers that their roaming SIMs cannot roam for too long on the home network continuously - or they may be switched off. Check with your providers before deploying large device volumes!

Some may significantly reduce device battery life - Roaming SIM Cards - Battery Life Impact

These SIMs are mentioned in the tables per country. However, they are listed here for convenience. Check the provider's website for a list of countries and networks the SIMs roam on:

Emnify
Soracom
Hologram
Twilio
1NCE
Onomondo
M2M One
Vodafone Global Roaming

Our Results/Findings

See our other article discussing Connectivity - LTE-M vs NB-IoT, Coverage, Providers and Roaming summarising our current confidence level in the various technologies and SIMs.

How do I configure any network settings if required?

Our devices use clever firmware features to automatically detect which type of SIM card is installed in a unit on startup, and automatically apply the right settings to get online. We call this Autonet.

In the majority of cases, devices will get online automatically with no special setup. However, this is not a guarantee.

Once online, it is recommended that you specifically configure your settings - but this is easy to do Over-The-Air.

If you are unsure whether your device will get online automatically, it is best that you order a DMLink Cable with your devices. Configuration instructions are detailed here:

In many cases, we've heard from our partners that our latest generation devices automatically connect; without the manual configuration settings done on our previous generations.

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