The subscriber kept the contract, the number and the monthly bill. What disappeared was the travel spend — quietly redirected to an eSIM provider, airline, bank or booking platform.

The churn dashboard looks reassuring. The subscriber is active. Direct debit still works. Domestic usage is steady, no porting request has arrived, and the customer may even have renewed their handset.

Then they fly to Tokyo, open another app and buy 10GB of travel data from someone else.

Their home SIM remains active for calls, authentication messages and the number everyone already knows. The second profile handles maps, messaging, work files and ride-hailing. From the operator’s perspective, the customer never left. Commercially, however, one of the relationship’s most valuable moments has moved elsewhere.

This is not subscriber churn. It is margin churn: the loss of a profitable use case while the underlying customer relationship remains intact.

The invisible departure

Telecom churn models were built to detect a fairly clean event. A customer cancelled, ported out or stopped paying. eSIM makes the picture messier because it lets people change connectivity without changing their primary operator.

The GSMA says global eSIM smartphone penetration reached 5% at the end of 2025 and is expected to reach 10% by the end of 2026. That is not universal adoption, but it is enough to alter behaviour among frequent travellers and premium-device owners — precisely the customers operators usually want to retain.

READ MORE: Inside the eSIM Business: Who Earns, Who Spends, and Where the Margins Hide

Travel eSIM growth is accelerating with it. Juniper Research expects revenue from travel eSIMs to increase by 650% between 2024 and 2028. Kaleido Intelligence estimates traveller adoption reached 12% in 2025 and could rise to 31% by 2030. Kaleido also expects substantial wholesale revenue for operators, an important qualification: the retail sale may be lost even when an operator still earns something underneath.

So “eSIM is killing roaming” is too crude. The traffic often still runs over an operator network. What changes is who owns the customer interface, sets the retail price and keeps the larger share of the margin.

Why the dashboard stays green

Imagine a subscriber who historically spent €45 on roaming during two annual trips. This year, the domestic bill looks identical, but outbound roaming revenue falls to €4 because a travel eSIM carries the data.

A standard churn model sees stability. An ARPU dashboard shows only a modest annual change. The roaming team sees lower usage, but may attribute it to Wi-Fi, shorter trips, changed destinations, or simple caution.

Nothing flashes red because the customer has not withdrawn from the relationship. They have unbundled it.

Subscriber churn asks whether the account survives. Usage churn asks whether consumption falls. Margin churn should ask whether a profitable activity migrated to another provider while the account remained open.

READ MORE: Why Specialist eSIM Providers Are Not Replacing Operators Yet

It cannot treat every roaming decline as competitive loss. Some customers never travelled; others would have switched roaming off rather than paid for it. A credible model needs a likely travelling cohort, historical spend, destination mix, eSIM-capable devices, roaming-pass attachment and contribution margin — not revenue alone.

The privacy line matters too. Operators do not need every flight or hotel booking. Aggregated, consented travel signals and existing network behaviour can identify patterns without turning retention analytics into surveillance.

Travel spend has new owners

The change is bigger than specialist eSIM brands selling cheaper gigabytes. Banks, airlines and travel platforms increasingly reach the customer at a better moment.

Revolut says customers have activated millions of data plans across more than 100 destinations since it introduced eSIM access in 2024, making eSIM its most popular non-financial app feature. In July 2026, Starling added travel eSIM plans to its banking app, alongside overseas spending and travel tools.

Trip.com has also become a connectivity distributor. Its 2026 partnership with Orange Travel places eSIM packages directly inside the booking platform, ready to select and pay for before arrival.

These companies do not necessarily understand networks better than operators. They understand the trip sooner. The airline sees the booking. The bank sees foreign-currency activity. The travel platform knows the destination and dates. The operator may own the primary SIM yet still arrive with a welcome text after the customer has installed an alternative.

That timing gap is where margin churn happens.

A metric operators can use

A practical margin-churn rate could compare the roaming contribution margin expected from a travelling customer segment with the margin actually retained across retail and attributable wholesale activity.

“Contribution margin” is deliberate. Cutting a €40 roaming pass to €15 may preserve usage while reducing profitability. Losing the retail transaction to an eSIM brand may look worse than it is if wholesale income and customers who would otherwise have generated nothing are ignored.

The metric should be segmented. Frequent business travellers behave differently from families taking one holiday. EU roaming-inclusive customers are not comparable with subscribers visiting Switzerland, Türkiye, the United States or Asia. Premium plans with roaming included need a different baseline from prepaid accounts.

Nor is this equally urgent for every operator. A domestic challenger with little outbound travel, weak analytics or generous international inclusion may gain more from fixing coverage or customer care first. Margin churn matters most where roaming remains commercially important and eSIM-capable customers are visibly moving travel data elsewhere.

Compete, bundle or distribute

Operators have several responses, and copying a travel eSIM marketplace is only one.

AT&T’s International Day Pass protects continuity: customers use their existing plan in more than 210 destinations for a daily charge. T-Mobile includes varying amounts of international high-speed data in qualifying plans and sells passes when customers need more. Both reduce the reason to install a second profile by making the home relationship easier to keep abroad.

READ MORE: Travel eSIM Economics: Why Repeat Users Matter

Orange is pursuing a wider model. Orange Travel sells prepaid eSIMs to people who may not be Orange subscribers, while partnerships with Trip.com, Accor and others move the offer closer to the travel journey. Orange also participates at wholesale level, competing for retail margin while supplying part of the market beneath it.

For some operators, an API or white-label partnership will make more sense than building a global consumer brand. Others should simplify roaming zones, introduce automatic caps or turn international data into a premium-plan benefit. The uncomfortable but rational choice may be to cannibalise an expensive legacy product before a bank or airline does it for them.

Conclusion: The account is no longer the whole customer

The contest is not roaming versus eSIM as technologies. It is between different ways of owning the travel moment.

AT&T monetises convenience. T-Mobile uses international access to strengthen the domestic plan. Orange works across retail, wholesale and travel distribution. Revolut, Starling and Trip.com show that a company can capture connectivity spend without owning the subscriber’s main mobile relationship.

An operator can therefore report low churn while becoming the customer’s authentication line: trusted, necessary and commercially thinner every time that person crosses a border.

Margin churn should not replace subscriber churn, or become another decorative dashboard. Used properly, it reveals a strategic leak that traditional KPIs hide. The question is no longer simply, “Did the customer stay?”

It is: when the customer travelled, who kept the value?