Millions of travellers already carry phones capable of making international connectivity far easier. They book flights in apps, store boarding passes in digital wallets, navigate with maps and order a ride within minutes of landing.

Yet ask whether that same phone supports eSIM and the confidence often disappears.

That is the contradiction sitting at the centre of the travel eSIM market. Device support is expanding, demand for mobile data is unquestioned and adoption is accelerating. Consumer understanding, however, is still lagging behind the technology.

The industry’s next big growth opportunity may therefore have less to do with adding another destination or shaving another euro off a plan. It is about closing the confidence gap.

Ready phone, uncertain owner

A YouGov survey commissioned by Proximus Global/BICS found that only 33% of respondents across the US, UK and China knew what an eSIM was. Another 42% were unsure whether their phone included one. Once the benefits were explained, however, 49% expressed interest in eSIM-enabled services.

Those numbers point to a market constrained less by demand than by uncertainty. Travellers already know they need maps, messaging, banking apps and transport after landing. What they do not always know is whether an eSIM will interfere with their primary number, whether WhatsApp will continue working, when the plan should be installed or what happens if activation fails.

READ MORE: eSIM Smartphones Hit 60% in Premium Market

These may look like basic questions to the telecom industry. To a traveller standing in an airport arrivals hall, they are the product.

For years, travel eSIM marketing concentrated on the obvious enemy: expensive roaming. The promise was simple—buy data before departure, install it digitally and avoid the airport SIM counter. That remains a strong proposition, but repeating “cheaper than roaming” will not persuade someone who is unsure where to tap in their phone settings.

Hardware is moving faster

The compatibility problem is gradually shrinking. GSMA Intelligence estimates that eSIM smartphones represented 5% of the global smartphone base at the end of 2025, rising to 10% by the end of 2026 and doubling again in 2027. By 2030, it expects eSIM smartphones to outnumber devices relying on traditional removable SIM cards.

That does not automatically turn compatible-phone owners into confident buyers. A growing addressable market is not the same as an activated one.

READ MORE: How to Activate an eSIM Without Getting Stuck

Nor is travel eSIM the right answer for every trip. A traveller whose domestic operator includes generous roaming may gain little by adding another plan. Someone using an older or carrier-locked handset may not be able to use one at all. For a long stay requiring a local number, a physical local SIM—or an operator plan with calls and SMS—can still be the more practical choice. Pretending otherwise only creates the disappointment that better education is supposed to prevent.

The new competitive layer

Juniper Research forecasts that travel eSIM users would rise from 40 million in 2024 to more than 215 million in 2028. Meanwhile, ACI World expects airports to handle 10.2 billion passenger journeys in 2026.

The opportunity is enormous, but so is the risk of commoditisation. Specialist travel eSIM providers, mobile operators and an expanding group of airlines, banks and travel platforms can increasingly sell access to similar underlying networks. Coverage tables and data allowances still matter, but they are becoming easier for competitors to match.

The harder advantage to copy is a customer journey that removes doubt before money changes hands.

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

That means a compatibility check that produces a clear answer, installation guidance written for ordinary users, honest activation instructions, visible fair-use conditions and support that understands the difference between installation, activation and network registration. Providers also need to explain the details travellers actually care about: whether they can retain their main SIM for calls, whether hotspot use is allowed and how much data common travel activities consume.

The experience can still improve across much of the category. Device compatibility is often buried, “unlimited” plans can arrive with poorly explained restrictions, and troubleshooting tends to begin only after something has failed. The strongest providers will treat education as part of the service, not as a help-centre page customers discover in distress.

Conclusion: Trust becomes the product

The market is no longer a simple contest between travel eSIM and traditional roaming. Mobile operators are improving roaming bundles and adding eSIM journeys of their own; specialist providers are competing on regional plans, unlimited offers and app experience; travel brands are embedding connectivity directly into booking flows.

In that environment, awareness is not merely a marketing problem. It is the point at which providers either earn trust or lose the customer back to a familiar—if more expensive—option.

The winners will not be those that explain eSIM technology most exhaustively. They will be those that make the traveller feel certain: my phone supports it, my main number is safe, I know when it activates, and help exists if it does not work.

Hardware adoption will expand the market. Confidence will decide who captures it.