English 
Dutch 
German 
Spanish A fleet of 200 cold-chain logistics units crosses the Dutch-German border 400 times a month. Each unit carries an M2M SIM from a carrier based in the Netherlands. The SIM is steered: it has a preferred network list that keeps it on the Dutch carrier’s partner network as long as any residual signal exists. At the border, the unit spends 90 seconds in a dead zone while the SIM holds onto a vanishing Dutch signal before finally releasing and registering on a German carrier. For 90 seconds, every 400 crossings, the device is offline. That is 10 hours of aggregate connectivity loss per month from the roaming architecture alone, not from hardware failure, not from network outages, but from a commercial decision the SIM provider made on behalf of the fleet operator without their knowledge.
Steered versus non-steered roaming is the most consequential technical decision in IoT SIM selection, and the most consistently overlooked one. It does not appear on most SIM comparison sheets. It is not visible in the product name. And its effects only show up at scale and at borders, which is exactly where IoT deployments that span countries run into it.
This article defines steered and non-steered roaming precisely, explains the mechanisms that cause the difference, and shows what each architecture means in practice for fleet tracking, maritime, broadcast, and industrial IoT deployments operating across borders.
Steered and non-steered roaming: precise definitions
What is steered roaming?
Steered roaming is a SIM configuration in which the device is directed toward specific carrier partners, overriding the device’s natural network selection based on signal strength. The steering logic is programmed into the SIM applet or enforced at the core network level by the SIM provider. When a device powers up or searches for a network, the steering mechanism pushes it toward the SIM provider’s preferred commercial partners in that country, even if a stronger signal from a different carrier is available.
The preferred network list, technically the PLMN (Public Land Mobile Network) list, contains the MCC/MNC (Mobile Country Code / Mobile Network Code) identifiers of the preferred carriers in order of priority. The device works through this list before considering other available networks. The list is set by the SIM provider based on their commercial roaming agreements, not based on which network performs best for the end device.
What is non-steered roaming?
Non-steered roaming, also called open roaming or carrier-neutral roaming, is a SIM configuration with no preferred network list. When the device scans for available networks, it selects the one providing the strongest signal at its current location, across all carriers operating in that region. No commercial steering pushes the device toward a specific partner. The selection is based entirely on measured signal strength and network availability at the device’s position.
A non-steered SIM from a provider with broad carrier agreements, such as Weconnect with 700+ carrier partnerships across 195 countries, gives the device access to the full set of available networks at every location. The device always connects to the strongest available signal from the widest possible pool of options.
Why the distinction matters more for IoT than for consumer devices
A smartphone user in a foreign country experiences steered roaming as a slower network or slightly higher latency. They can override it manually: go to settings, scan available networks, select a different carrier. An IoT device has no user to do this. It runs unattended, follows its SIM’s network selection logic, and cannot override steering programmatically in most deployments. Whatever the SIM does, the device does. For an IoT device crossing a border 400 times a month, the steering behaviour is not an inconvenience. It is a systematic and repeated connectivity failure built into the architecture.
How steering causes connectivity failures at borders
The failure mode is consistent across deployment types. Understanding the mechanism helps explain why it is so hard to diagnose without knowing to look for it.
The handover zone
When a device approaches a national border, it moves through a transition zone where one country’s carrier signals fade and the next country’s signals become available. In ideal conditions, this zone has signal overlap: both countries’ carriers are reachable simultaneously for a few kilometres, and the handover can happen smoothly. In practice, the overlap zone at maritime or rural borders is often narrow, and a steered SIM’s refusal to release the previous carrier extends the time the device spends without a usable connection.
The PLMN hold behaviour
A steered SIM will attempt to stay registered on its preferred carrier until the signal drops below the SIM’s configured release threshold. This threshold is set conservatively to avoid unnecessary network switches in areas with variable signal. At a border, this means the device holds onto a fading preferred carrier signal rather than switching to a strong available alternative. The hold can last from a few seconds to several minutes, depending on how the SIM is configured and how quickly the signal drops.
The registration delay after release
Once the steered SIM finally releases the previous carrier, it does not immediately connect to the strongest available network. It works through its PLMN priority list, attempting each preferred carrier in sequence before falling back to any available network. If the preferred carriers in the new country are not the strongest available at the device’s position, the registration process takes longer. A non-steered SIM skips this list entirely and registers on whatever network provides the best signal, completing the handover faster.
How steered roaming affects different IoT sectors
Fleet tracking and logistics
A commercial vehicle crossing from the Netherlands into Germany needs its tracking unit online continuously. Each connectivity gap means a missing position report, a failed exception alert, or a delayed temperature reading from a cold-chain unit. For fleets running multi-country European routes, the Dutch-German, German-Polish, and Belgian-French crossings each represent a systematic gap with a steered SIM. Non-steered roaming on a multi-network M2M SIM eliminates these gaps: the device detects German carriers as soon as their signal is usable and switches without holding onto the Dutch preferred carrier.
Maritime vessels
A vessel sailing from Danish to German territorial waters passes through a narrow band where Danish coastal towers fade and German towers become reachable. Weconnect’s earlier articles on carrier switching at sea cover this in detail. The core issue is identical to fleet tracking: a steered SIM prolongs the dead zone. For vessels running operational data uploads on a fixed schedule, a connectivity gap at the border means a missed upload window. For crew welfare connectivity, it means a dropped video call. For a non-steered multi-network maritime SIM, the same crossing is transparent.
Broadcast and live events
A broadcast encoder moving with a crew across a national border, or operating at a venue near a border, faces the same issue at higher consequence. A LiveU encoder with steered SIMs can lose its bonded cellular links for 30 to 90 seconds at a border transition. For a live news feed or a sports broadcast, 30 seconds of connectivity loss is catastrophic. Non-steered multi-network SIMs allow the encoder to switch carriers at the optimal signal moment, not after the steering logic decides to release.
Industrial IoT and remote infrastructure
SCADA sensors, remote monitoring equipment, and industrial IoT devices installed near borders or in countries other than the SIM provider’s home market face a longer-term version of the same problem. A steered SIM may perform adequately at installation time, when the preferred carrier has good coverage, and then degrade as network infrastructure changes, as the device ages, or as the SIM provider renegotiates its commercial agreements and updates the preferred network list. A non-steered SIM tracks actual signal quality rather than a preference list that may no longer reflect current conditions.
Why SIM providers use steering: the commercial mechanism
Understanding why steering exists helps evaluate whether a provider’s non-steered claim is genuine. Steering is not a technical accident. It is a deliberate commercial mechanism.
SIM providers negotiate roaming agreements with carrier partners in each country. These agreements specify which partner network the SIM provider directs traffic to, and what wholesale rate the provider pays per megabyte. Steering maximises traffic volume on preferred partners, which improves the SIM provider’s commercial position in renegotiations and may reduce their per-MB cost. The cost benefit accrues to the SIM provider. The reliability cost is borne by the end customer’s devices.
Non-steered roaming typically costs the SIM provider more, because traffic is distributed across whatever networks have the best signal rather than concentrated on the most commercially favourable partners. Providers offering genuine non-steered roaming either absorb this cost or have built their pricing model around it. Weconnect’s IoT SIM solutions use non-steered multi-network access as the default architecture, with 700+ carrier partnerships across 195 countries built to provide signal-strength-based selection rather than commercial preference.
How to verify whether your IoT SIM is steered or non-steered
Most SIM providers do not prominently advertise steering behaviour. Verification requires asking specific questions and, where possible, testing directly.
Ask for the PLMN list and its contents
Request the full PLMN list for each country where your devices operate. If the provider cannot or will not provide it, treat that as a signal that steering is in use. A genuine non-steered provider has no PLMN list to protect. If a list is provided, check whether it contains a single preferred carrier per country or multiple carriers in priority order: either indicates steering.
Test at a border crossing
The most direct test is to place a device with the SIM at a known border crossing and measure connectivity during the transition. Log the time from when the previous carrier’s signal becomes unusable to when the new carrier registers. A non-steered SIM on a well-connected provider typically completes the transition in under 10 seconds. A steered SIM in the same location may take 30 seconds to several minutes.
Check for ‘carrier-neutral’ and ‘open roaming’ language
Providers offering non-steered roaming typically use the terms carrier-neutral, open roaming, or non-steered explicitly in their product documentation. If a provider’s documentation describes automatic connection to the strongest available network without mentioning commercial preference, read it carefully: non-steered is a specific technical claim, not just a marketing description of broad coverage. Ask whether the claim applies to all countries in the provider’s network or only to specific regions.
Frequently Asked Questions
What is the difference between steered and non-steered roaming?
Steered roaming directs a SIM toward specific carrier partners based on the SIM provider’s commercial agreements, using a preferred network list (PLMN list) programmed into the SIM. The device connects to the preferred carrier even if a stronger signal from a different carrier is available. Non-steered roaming has no preferred network list. The device connects to whichever network provides the strongest signal at its current location, across all available carriers. For IoT devices operating unattended across borders, non-steered roaming provides consistently faster handovers and fewer connectivity gaps.
Does steered roaming cause connectivity problems for IoT devices?
Yes, specifically at national border crossings and in areas where the preferred carrier has weaker coverage than alternatives. A steered SIM holds onto a fading preferred carrier signal rather than switching to a stronger available alternative, creating connectivity gaps that repeat systematically at every border crossing. For fleet tracking, maritime, broadcast, and industrial IoT deployments operating across borders, steered roaming creates predictable and avoidable connectivity failures.
How do I know if my current IoT SIM is steered?
Ask your SIM provider for the PLMN list for each country where your devices operate. If a preferred network list exists, the SIM is steered. You can also test directly: place a device at a national border crossing and measure the time from when the previous carrier’s signal becomes unusable to when the new country’s carrier registers. A steered SIM typically takes significantly longer to complete this handover than a non-steered SIM on the same network.
Is non-steered roaming always the right choice for IoT?
For cross-border deployments, deployments in regions with variable carrier coverage, and deployments where connectivity continuity is a functional requirement, non-steered roaming is the correct architecture. The only case where steered roaming may be preferable is a deployment entirely within a single country on a single carrier’s network, where the preferred carrier provides the best coverage everywhere the device operates. As soon as the deployment crosses a border or depends on coverage continuity across different carrier footprints, non-steered roaming provides better reliability.
What is a PLMN list and how does it affect my IoT SIM?
A PLMN list (Public Land Mobile Network list) is the list of preferred carrier identifiers programmed into a SIM card. The device uses this list to select which network to register on, working through the list in priority order before considering other available networks. A steered SIM has a PLMN list that reflects the SIM provider’s commercial agreements. A non-steered SIM has no effective PLMN list, or one that includes all available carriers without a commercial priority order, allowing the device to connect to the strongest available network.
How does Weconnect provide non-steered roaming?
Weconnect’s IoT SIM solutions connect across 700+ carrier partnerships in 195 countries with non-steered, carrier-neutral access as the default architecture. Devices connect to the strongest available network at their location without a commercial preference list directing them toward specific carriers. For cross-border deployments in Europe and globally, this means faster border handovers, fewer connectivity gaps, and consistent performance based on actual signal conditions rather than the SIM provider’s commercial relationships.
Next steps
If your IoT deployment crosses borders and you are experiencing connectivity gaps at transitions, or if you are evaluating SIM options for a new cross-border deployment, the roaming architecture is the first specification to confirm. Weconnect provides IoT SIM solutions with non-steered multi-network access across 700+ carriers in 195 countries, available across all form factors (physical SIM, eSIM, MFF2 ChipSIM) with private APN, IPsec VPN, and fleet management via the connectivity management platform. For a full buying framework covering form factors, security, and data plans, see our IoT SIM buyer’s guide.
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