Solving eSIM Limitations with a Connectivity Partner

GSMA SGP.32 foretold a revolution in the IoT ecosystem, with IoT deployment-designed eSIMs transforming the potential performance, reliability, and accessibility of devices. IoT eSIMS arrived with a compelling promise: they could help OEMs eliminate physical SIM logistics, switch carriers remotely, and deploy devices globally without being locked to a single network.

However, even with eSIM technology, IoT device OEMs and developers continue to encounter deployment challenges. Devices roam into markets like Brazil or Turkey and disconnect without warning when permanent roaming thresholds are hit. Profile switches fail because the device has already lost the connectivity it needs to download a replacement profile. Fleets running hardware across Cat-M1 sensors and high-bandwidth applications discover that their single eSIM profile cannot serve both. Fleets lacking true failover strategies are compromised when their primary carrier goes down.

These are the realities of IoT eSIM limitations that product teams encounter once deployments move beyond the lab. The root cause behind these failures is the same: eSIMs alone are a connectivity delivery mechanism, not a connectivity strategy. They enable profile switching and remote provisioning, but they do not create carrier relationships, guarantee native network access, or build in redundancy.

In this article, we will explore specific gaps that eSIM hardware alone cannot close and what a connectivity partner must provide to make eSIM work reliably at scale. For OEMs managing global IoT deployments, that typically means pairing eSIM capability with a provider that can deliver native connectivity, multi-network resilience, and centralized operational control through a single global IoT connectivity service.

The eSIM is a delivery mechanism, not a complete solution

An eSIM is built around eUICC hardware, which stores carrier profiles and switches between them over-the-air via SM-DP+ servers. In practical terms, this means a single SIM can hold multiple carrier profiles and switch between them without a physical SIM swap. For IoT device manufacturers, that capability removes a significant source of hardware complexity. It also reduces administrative planning and costs by eliminating the need for physical SIM swaps, truck rolls, and maintenance visits.

However, an eSIM alone does not create carrier access. Downloading a carrier profile is not the same as having a relationship with that carrier. The profile is a credential. The carrier relationship determines whether that credential grants native access, roaming access, or no meaningful access at all in a given market.

This distinction gets lost in a lot of eSIM marketing. Multi-carrier hardware does not equal multi-carrier connectivity. An eSIM loaded with five profiles is only as useful as the carrier agreements behind each one.

What eSIM Does Not Provide on Its Own

eSIM hardware handles profile storage and delivery. An eSIM alone does not handle the layers above it that determine whether a deployment actually works reliably. This includes:

• Carrier relationships: Direct agreements with mobile network operators that determine network access type, priority, and feature availability
• Native network access: The difference between connecting as a native subscriber versus a roaming device on a host network
• Automatic redundancy: The ability to fail over to a secondary carrier when a primary network goes down, without manual intervention

These are commercial and architectural requirements, not hardware features. An eSIM without these layers in place is still subject to the same roaming restrictions, coverage gaps, and failover limitations as a traditional SIM, despite its more sophisticated delivery mechanism.

At scale, those missing layers create operational overhead as well. If your team is managing multiple carriers, SIM states, and usage policies across regions, you need more than remote provisioning. You need a connectivity management layer that gives you a single pane of glass for activation, monitoring, and SIM fleet management across carriers and geographies.

Three major eSIM limitations solved through connectivity provider partnerships

1. eSIMS don't automatically provide native connectivity

Many eSIM solutions route devices through roaming agreements rather than native carrier profiles. The device connects, data flows smoothly, and nothing looks wrong, until the device runs afoul of international roaming regulations and deployments find themselves disconnected in the middle of critical operations.

Why roaming-only can create deployment risk

When a device connects through a roaming agreement rather than a native profile, it operates as a guest on the serving network. That status carries potential consequences:

• Lower network priority: Roaming devices can be deprioritized relative to native subscribers, which affects performance during peak load, depending on carrier policy and inter-operator agreements
• Feature restrictions: Power-saving features like PSM and eDRX, critical features for battery-operated IoT devices, may be unavailable on roaming connections, depending on the operator, network, and IoT agreement.
• Higher data costs: Roaming data rates are typically more expensive than native rates, which compound as fleet scale.
• SMS and voice limitations: Some roaming profiles do not support SMS or voice, limiting functionality for devices that depend on these channels for operations.

It's important to note that eSIM profile-switching capability does not change any of this inherently. A device running a roaming-based eSIM profile is still a roaming device on the serving network, regardless of how sophisticated the SIM hardware is.

Markets where permanent roaming is restricted

Beyond performance limitations, roaming-based eSIM deployments face a hard regulatory ceiling in several major markets. Permanent roaming is not universally permitted, and the consequences of crossing a threshold can be significant:

• Brazil, Turkey, and Nigeria impose restrictions on permanent roaming, though the specific rules and enforcement mechanisms vary by country and service context.
• The European Union applies a fair-use framework with an observation period for detecting anomalous roaming usage, which can affect long-term roaming arrangements.
• Australia applies roaming thresholds that vary by carrier policy, commercial terms, and service configuration, rather than a universal cutoff.

When a device crosses these thresholds, consequences can include surcharges, service restrictions, or migration requirements, depending on the market and operator. For a fleet operator managing thousands of devices across regions, this creates unpredictable disruptions that are difficult to diagnose and expensive to remediate.

eSIM enables profile switching, but it does not create the carrier relationships that determine whether a device connects natively in a given market. Without native access behind the SIM, market expansion carries real connectivity risk.

This is where working with a partner, like Zipit Wireless, that offers native connectivity and global roaming options through established Tier-1 carrier partnerships becomes strategically important, especially if you are trying to reduce deployment risk without adding carrier-management complexity. Zipit Wireless is a global connectivity orchestration layer, granting IoT device OEMs access to native connectivity and sustainable roaming strategies through our network of contracts with prominent global carriers.

2. eSIMs aren't always designed to handle varying data needs

The second gap involves profile flexibility. Many eSIM solutions are tied to a single plan type, which creates a problem for IoT deployments that mix devices with very different connectivity requirements.

eSIMs exist in a fragmented system of connectivity networks

Operators provision profiles differently depending on the network technologies and services enabled. A profile designed for an LPWAN like NB-IoT usage may not support broader LTE services. A profile may not support voice or SMS. Access to 5G SA may require separate provisioning depending on the operator. For OEMs managing mixed fleets, this means managing multiple SIM SKUs across regions and device types, which is precisely the operational complexity eSIM is supposed to eliminate.

The result is a fragmented SIM ecosystem where the hardware promise of simplification runs directly into the commercial reality of carrier profile structures.

Why one profile does not fit all use cases

Consider a vehicle telemetry deployment that includes both security cameras requiring sustained high-data LTE throughput and asset tracking sensors running on Cat-M1 with multi-year battery life requirements. These devices may not be able to share a single profile type. Forcing them onto the same profile either wastes power on the sensor network or starves bandwidth on the camera fleet.

A capable eSIM solution needs to support multiple profiles optimized per use case — Cat-M1, LTE, 5G SA, and voice/SMS where needed — on the same SIM, with the ability to shift profiles as deployment needs change. Without that flexibility, eSIM consolidates the hardware without consolidating the operational complexity.

For teams running mixed fleets across product lines, this is not just a technical preference. It is a scalability requirement. A connectivity partner that supports multiple network technologies, localized and multi-carrier SIM strategies, and both low- and high-data use cases can help you standardize infrastructure without forcing every device into the same connectivity model.

3. eSIMs don't necessarily provide true network redundancy and automatic failover

The third gap is the one likely to surface during a critical moment. eSIMs that do not support native connectivity will struggle to maintain full functionality and unbroken connectivity across unlimited and high-gigabyte plans.

The "chicken and egg" connectivity problem with eSIMs

When a device loses connectivity entirely, it cannot reach the remote provisioning server to download a replacement carrier profile. There is no connection over which to retrieve it. This is a structural limitation at the center of many eSIMs, not a device defect, but a dependency built into how over-the-air profile delivery works.

Without profiles stored locally on the SIM before an outage occurs, failover in a true connectivity failure is not possible. The device is offline, and the mechanism for recovery requires the device to be online.

For medical devices, security systems, payment terminals, and high-data industrial applications, that window is not acceptable. The gap is not in the hardware. It is in how many eSIM solutions are architected: profiles may be downloaded on demand rather than stored locally, which means recovery depends on the connectivity that has already failed.

If uptime and SLA adherence matter, your failover strategy cannot depend on manual intervention or fragmented carrier portals. You need operational visibility and control across your entire deployment, ideally through a hosted platform that standardizes workflows, reporting, and alerts across networks.

Zipit Wireless has implemented redundancy into its upcoming first eSIM model, allowing it to automatically failover to a second carrier if a network outage occurs. This can be achieved because Zipit has all the necessary carrier profiles locally on the SIM. Unlike some roaming carrier SIM profiles that have limitations (e.g., no SMS or voice support), Zipit's approach uses native profiles to safeguard connectivity.

Solving these challenges creates operational simplicity and facilitates scale

The three gaps covered above do not stay confined to the network layer. At fleet scale, each one generates operational and financial consequences that compound quickly.

Operational complexity and SKU fragmentation

When a SIM cannot consolidate profiles across network types, OEMs still manage multiple physical SIM SKUs across regions and device categories. A Cat-M1 sensor fleet requires one SIM. An LTE camera deployment requires another. A voice-enabled device requires a third. Each SKU carries its own procurement process, inventory position, and manufacturing line configuration.

This creates overhead across the entire supply chain:

• Procurement: Separate vendor relationships and order cycles per SIM type
• Inventory: Multiple SKUs to stock, track, and reorder across warehouses and regions
• Manufacturing: Different build configurations per device variant, increasing line complexity and error risk
• Global scaling: Expanding into a new market often means qualifying and sourcing another regional SIM, adding lead time before a single device ships

Multi-profile eSIM resolves this by consolidating profiles for different network topologies onto a single SIM. One SKU covers Cat-M1, LTE, and 5G SA across markets. That simplifies procurement, reduces inventory carrying costs, and allows a single hardware build to serve multiple deployment types. The operational benefit compounds as the fleet grows.

Power-saving feature restriction on roaming connections

For battery-operated IoT devices, PSM (Power Saving Mode) and eDRX (Extended Discontinuous Reception) are the difference between a device that lasts years in the field and one that requires frequent field service visits. Both features allow devices to enter low-power sleep states between transmissions, dramatically reducing energy consumption.

The problem is that PSM and eDRX must be negotiated directly with the serving network. Roaming devices do not have that standing. Many roaming connections may not support these features, which means a device running a roaming-based eSIM profile may consume more power than intended, with no error, no alert, and no indication that anything is wrong.

For a fleet of thousands of sensors deployed in remote locations, the impact is significant: shorter battery life, more frequent field service, and higher maintenance costs. Native carrier access is required to negotiate PSM and eDRX. This is why roaming-based eSIM deployments often fail to deliver the power efficiency that device specs promise.

The business cost of connectivity gaps

Connectivity failures are not just a technical problem. They carry direct financial consequences that scale with fleet size.

• SLA penalties: Uptime commitments to end customers become difficult to meet when roaming cutoffs or failover gaps introduce unplanned downtime.
• Customer churn: Repeated connectivity issues erode confidence in the product, particularly in competitive markets where alternatives exist.
• Unplanned field service: Devices that disconnect due to roaming thresholds or profile failures often require on-site intervention, which is expensive and difficult to schedule at scale.
• Market expansion risk: Entering a new region without native carrier access means operating under roaming restrictions from day one, limiting the commercial viability of the expansion.

Connectivity is an operational system with financial consequences, not a feature that can be evaluated in isolation. The architecture decisions made at deployment time, including roaming versus native, on-demand profiles versus locally stored, and manual failover versus automatic, determine the cost structure and reliability profile of the entire fleet.

For scaled operators, this is also where centralized management starts to matter as much as connectivity itself. When you can activate devices in bulk, monitor usage with granular alerts, and organize SIM fleets by carrier, geography, or rate plan from a single pane of glass, you reduce operational burden while improving control. Zipit Wireless's managed connectivity services, connectivity management platforms, and billing solutions provide comprehensive solutions to IoT OEMs using eSIMs to facilitate their innovations.

What eSIMs for IoT actually require to work

eSIM hardware is a powerful foundation. But it is only as capable as the infrastructure built on top of it. Some solutions must exist above the eSIM hardware layer for a deployment to work reliably at scale:

1. Direct carrier relationships that enable native profiles. Without agreements with mobile network operators in each target market, devices default to roaming, with all the restrictions, costs, and regulatory risk that entails.
2. A multi-topology profile architecture. A single SIM needs to support different network types, including Cat-M1, LTE, 4G, Redcap, 5G SA, and voice/SMS where required, so mixed fleets can operate without multiple SIM SKUs.
3. Locally stored profiles that enable automatic failover. Profiles must be on the SIM before an outage occurs. Recovery cannot depend on a network connection that has already failed.

These are commercial and architectural requirements. No amount of hardware sophistication substitutes for them.

The future of eSIM for IoT: infrastructure, not just technology

Treating eSIM technology as a complete solution rather than a foundation that requires deliberate infrastructure built on top of it is a mistake. The IoT eSIM limitations that surface in production, like roaming cutoffs in Brazil or Turkey, failed profile switches during outages, and power-saving features that silently stop working, are not hardware defects. They are the predictable result of deploying a delivery mechanism without the carrier relationships, profile architecture, and redundancy layers that make it function reliably at scale.

The next generation of eSIM deployments will be defined by native carrier access that eliminates roaming risk, multi-topology profile support that consolidates mixed fleets onto a single SKU, and automatic failover that does not depend on a live connection to recover from an outage. Each of these requirements connects directly to outcomes that matter in production: uptime, cost control, and the ability to scale into new markets without rebuilding your connectivity architecture.

eSIM's promise is real, but it requires the right partner to deliver it and the right eSIM technology to enable it. The hardware enables profile switching. Selecting an IoT connectivity partner like Zipit Wireless, which deeply understands the nuances of eSIM infrastructure, will help you find the best solutions for your IoT business.

How Zipit Wireless solves eSIM limitations

Native carrier profiles stored locally on the eSIM

Zipit pre-loads native carrier profiles directly onto the SIM rather than relying on over-the-air downloads at the time of need. When a primary carrier fails, the SIM switches to a secondary native profile, with no provisioning server and no live connection required. The chicken-and-egg problem is resolved before the device ever leaves the factory.

Multi-topology profile support on a single eSIM

Zipit delivers profiles optimized for Cat-M1, LTE, and 5G SA on the same SIM, along with support for voice and SMS where deployments require it. OEMs managing mixed fleets consolidate to a single SKU rather than maintaining separate SIMs per network type. That simplifies manufacturing, procurement, and global scaling.

Built-in redundancy without manual intervention

Redundancy is designed into the SIM architecture itself. If a carrier network fails, the SIM fails over automatically to a secondary native carrier profile, with no operator trigger and no platform dependency.

If you are evaluating eSIM providers or working through a global deployment strategy, contact us to start the conversation.

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