How an eSIM Roaming Bill Nearly Cost a British Family €98,400

The family break had unfolded as expected: airport queues, theme parks and jet lag were already becoming distant memories. A few weeks later, however, an ordinary moment at work brought a financial shock that nearly erased the summer’s happiness.

A family holiday that became a financial scare

Last summer, a British couple travelled around the United States with their children for several weeks, seeing relatives in New York, Atlanta and Florida. It was the sort of trip that many families spend years saving towards, involving long-haul flights, domestic connections, countless photographs and video calls back home.

Like many regular travellers, the father had attempted to plan ahead. He knew that US roaming could be extremely expensive. Before departure, he purchased an eSIM from a specialist supplier, intending to access American mobile data at local prices while leaving his UK tariff in the background.

The eSIM was meant to shield him from roaming charges. Instead, a technical detail nearly cost him around €98,400.

He set the virtual SIM as the primary line on his smartphone. His intention was straightforward: connect to the local network, avoid roaming fees and come back with holiday photographs rather than a huge financial burden. For several weeks, there appeared to be no issue. The family rang relatives, used maps, watched videos and posted updates from their travels online.

The moment the bill arrived

After returning to the UK in early September, everyday life began again. During a video meeting at work, the father received a notification from his mobile provider. He opened it while still on the call, saw the amount and turned pale.

His bill demanded about €98,400 for mobile use while he was in the United States. In pounds, this equated to approximately £84,000 - nearly the cost of a house deposit in many parts of the country.

“I thought I’d misread it,” he later told reporters. “People on the video call saw my face drain of colour.”

The invoice contained enormous roaming fees, of the sort normally shown in industry training presentations as “worst case” examples. But the provider’s system showed genuine usage: data, calls and messages logged on his UK SIM, despite his belief that the eSIM was managing everything.

When an eSIM does not work as expected

The incident illustrates a technical pitfall that many travellers may not fully appreciate. An eSIM is a digital SIM card held on a phone’s chip rather than on a small plastic card. Modern smartphones can operate multiple profiles simultaneously, including a physical SIM and one or more eSIMs.

However, the way a handset uses those lines is governed by a mixture of settings that can be unexpectedly difficult to understand. For instance:

• One line may handle calls and messages while another supplies mobile data.
• Roaming may be switched off on one SIM while remaining enabled on the other.
• Certain apps or services can automatically move between lines when signal coverage is poor.

When a UK SIM is still enabled for data or calls overseas, roaming costs can accumulate unnoticed in the background, even if the traveller thinks all usage is being handled by the eSIM. In this instance, the father believed he had selected the eSIM as his primary plan. The operator’s systems, however, recorded heavy use of the British line across American networks.

How the bill approached €100,000

Telecoms specialists quoted by local media explained that US roaming is no longer subject to EU price caps. Beyond the European Union, providers often use wholesale arrangements under which data can cost several euros per megabyte.

Watching one HD film, sending high-resolution holiday videos, using cloud backups or allowing automatic app updates can consume gigabytes within a few hours. At those costly out-of-bundle prices, the amount can rise into the tens of thousands with remarkable speed.

Outside the EU, a few days of heavy data use can technically generate bills that look more like a luxury car price than a phone invoice.

The operator identified the unusual level of use and began an internal investigation. That did not, however, halt the billing procedure. In October, while the case was still being reviewed, the company collected a direct debit of around €15,100 from the customer’s account.

A difficult wait and an unusual operator decision

For the British family, the following weeks were stressful and uncertain. They collected screenshots, reviewed the handset settings and submitted written complaints. The story was reported by media outlets in France and the UK, increasing pressure on the operator.

Internally, company teams reviewed network logs and configuration information. They examined the sequence of events, including the eSIM purchase, its activation on the phone and roaming records from US networks. Meanwhile, the customer maintained that he had acted in good faith and had tried to prevent precisely this outcome.

Several weeks later, the operator reversed its position. It agreed to remove the charges and repay the €15,100 already collected. The company acknowledged the customer’s “good faith” and said it would “waive all fees” associated with the trip.

The nightmare bill disappeared, but the case shows how a simple setting can trigger a devastating financial risk.

What this means for eSIM travellers

Although cases this extreme are uncommon, they reveal how delicate the balance can be between digital convenience and controlling costs. As more people adopt eSIMs for brief holidays and business travel, confusion over phone settings is becoming more common.

For people travelling outside the UK or EU, telecoms advisers suggest making several practical checks before getting on the plane:

• Turn off data roaming for your primary SIM in the handset settings.
• Set the eSIM as the sole active data line throughout the trip.
• Request that your provider applies a roaming spending limit or blocks roaming altogether.
• Disable automatic app updates and cloud backups over mobile data.
• Save screenshots of your settings in case you later need to challenge a bill.

Typical roaming scenarios compared

Scenario	Risk level	What usually happens
Roaming disabled on main SIM, eSIM for data only	Low	Mobile data uses the local plan, while the home SIM remains inactive abroad.
Both SIMs active for data, no cap set	High	The phone can switch between lines, creating parallel roaming charges.
Home SIM blocked by operator, Wi-Fi only	Very low	There are no roaming charges, although connectivity is restricted outside Wi-Fi hotspots.

Beyond this case: digital habits that quietly cost money

The story also demonstrates how today’s mobile habits can increase financial risk. When roaming first became available, travellers mainly made calls and sent a small number of text messages abroad. Now, one holiday day can include navigation tools, short-form videos, social media, photo backups and cloud documents, all operating in the background.

Every one of these services depends on an ongoing connection unless users intentionally limit it. On public Wi-Fi, there is no mobile-data cost. On overseas mobile networks without the right tariff, those same routines become premium-priced usage. Families sharing one data allowance between several phones and tablets can raise that risk even further.

People who frequently travel outside regulated areas may benefit from treating mobile connectivity as they would any other substantial expense. This could involve imposing a strict budget, checking contract terms before agreeing to them and following one basic rule: if the price of data per gigabyte is not clear, expect the worst and use Wi-Fi wherever possible.

A degree of digital minimalism may help as well. On long-haul journeys, travellers are increasingly turning off automatic cloud backups and postponing large uploads until they are home or can use reliable Wi-Fi. This reduces the chance of unexpected bills and can make people more aware of what they genuinely need in order to remain connected.