A £153,000 mobile bill is not a “mistake” in the normal sense. It is a system failure, a customer protection failure and a reminder that business roaming can still behave like something from another decade.

Karenjeet Kaur Johal, a 27-year-old entrepreneur from the West Midlands, reportedly received two bills after a work trip to San Francisco between 5 May and 18 May. The first came in at £57,386. The second added another £96,098. One individual call alone was said to have reached £37,000.

“I was just so shocked,” she said. “There is no way I could have paid this. My bill has never gone above £68 and I travel abroad every month.”

That sentence matters. This was a business traveller using her device for work, in a major global business city, expecting her mobile service to behave with some level of adult supervision.

The roaming trap

According to the report, Johal had no roaming package or active spending limit in place while using her device overseas. She maintains she asked for a £100 data cap when setting up the account. Currys Business reportedly said it could find no evidence of that request in the call records. O2 later said that when she signed up to the business contract through Currys, she “actively opted out of spending and roaming caps.”

That detail matters, but it does not end the story.

READ MORE: Optimizing Your Phone’s Roaming Settings to Avoid Bill Shock

Business users need to know what is included before travelling. A company line should have caps, alerts, approvals and a roaming plan before anyone lands in the United States. But a bill of this scale should not quietly accumulate in the background like a parking meter nobody can see.

Johal said she received “no warning, no alerts, and no spending notifications” during her time in the US. For a company, that becomes operational risk. A roaming charge does not stay inside the telecom department. It can hit cash flow, credit and supplier confidence.

Why business roaming is still dangerous

Many companies still treat mobile connectivity as a basic utility. Someone orders the SIMs. Someone assigns the lines. Travellers assume the phone will work. Finance only notices when the invoice arrives.

That model is no longer good enough.

The US is not an exotic edge case. It is one of the most common business travel destinations in the world. If a UK business line can generate a six-figure charge over twelve days without intervention, the issue is not only price. It is visibility.

This is where the roaming market has changed. Traditional operator roaming still has a place, especially for companies that want one contract, one number and one provider relationship. But it is not ideal for every traveller, every trip or every budget.

READ MORE: Enterprise eSIM Is Becoming a Corporate Standard — Here’s Why

Travel eSIMs and business eSIM platforms exist because travellers want more predictable options. Providers such as Airalo, Holafly, Nomad eSIM, Yesim and Ubigi have trained consumers to think in advance: destination, data allowance, validity and price. Enterprise-focused players push the idea further with dashboards, pooled usage, policy controls and real-time visibility.

A travel eSIM may not suit someone who needs to keep a UK mobile number active for calls. Unlimited eSIM plans can come with fair-use limits or speed controls. Enterprise eSIM platforms require setup and governance. But the direction is clear: the market is moving away from “use it first, discover the cost later.”

The missing layer

O2 eventually cancelled the disputed roaming charges “as a gesture of goodwill” after media involvement. Its spokesperson said:

“While we are not responsible for the management of Ms Kaur’s spend caps, given the significant costs involved in this particular case, we have agreed to waive all charges as a gesture of goodwill.”

That solved the invoice. It did not solve the trust problem.

Johal says the failed payment damaged her property firm’s credit score and cost her more than £200,000 in lost revenue. “Only after public intervention did O2 agree to remove the disputed roaming charges,” she said, adding that the decision did not address the wider damage caused.

READ MORE: Enterprise eSIM Global Coverage That Actually Works

This is why business connectivity needs a middle layer between the traveller and the bill. Not just a roaming bundle. Not just a PDF tariff. A visible control system that says: this user is abroad, this is the current cost, this is the cap, this is what happens next.

Ofcom has pushed UK mobile providers toward stronger roaming alerts and bill-limit options. That is welcome. But cases like this show that compliance is not the same as confidence.

The real lesson

The lesson here is not “never use roaming.” Traditional roaming can still make sense for some corporate users, especially when voice continuity and account management matter more than the cheapest data.

The real lesson is that invisible connectivity is now a business liability.

The better model is proactive: spending caps that are clearly confirmed, roaming alerts that actually arrive, travel policies that match real behaviour, and alternatives such as eSIMs or managed business connectivity when the trip profile demands it.

The smartest companies will not ask only, “Which provider is cheaper?” They will ask, “Can we see what is happening before it becomes a problem?” Price still matters. But visibility is becoming the real premium feature.