For years, travel eSIM has been a data story: Get connected faster. Pay less. Avoid roaming. That was the product, and for most providers, it still is.

Kolet is now pushing beyond that model by adding voice directly into its app. Users can make international calls over data, without relying on their primary SIM or dealing with roaming charges.

It’s a small change in functionality, but a meaningful shift in what an eSIM product is expected to do.

The quiet assumption behind “data-only”

Most travel eSIMs are data-only. And I get it: adding voice in a roaming environment is a proper headache technically.

But here’s the part that usually goes unspoken. That decision assumes your user will never need immediate resolution.

That they’ll be fine with chat support.
That they’ll have time.
That nothing will go wrong.

Real travel doesn’t work like that.

Think about this one: an American traveler buys an eSIM to save money. Everything works until he gets a flat tyre on a motorway in a rented car. No local number. Chat support not responding. He calls the rental company using his US SIM. The call costs more than the entire eSIM. That’s the experience he remembers.

Or a mother arriving late with tired kids. The gate won’t open. No one answers messages. She needs a solution in the next 60 seconds, not a chatbot.

These situations are not edge cases. They’re the exact moments that define whether a product actually works.

Data enables convenience. Voice enables resolution.

That’s the gap Kolet is trying to close.

Not adding voice. Reframing the product

Kolet’s implementation is deliberately simple. Calls run through internet-based telephony embedded directly in the app. No second number. No SIM switching. No extra setup.

But the important part is not how it works.

It’s what it does to the product.

Kolet is moving from “connectivity add-on” to something closer to a controlled communication layer inside travel.

Everything sits in one place:

• Data
• Voice
• Pricing logic
• User interaction

No fallback. No fragmentation. No dependency on external apps.

That’s a different ambition than most eSIM players, who are still optimizing around gigabytes and distribution.

Pricing as trust, not just cost

Kolet also makes a deliberate choice in how voice is priced.

Calls are paid using “Koins,” where 1 Koin equals €1. Before placing a call, users see the destination, per-minute rate, and exactly how long they can talk based on their balance.

No post-call billing. No ambiguity.

This is not about simplifying payments. It’s about removing hesitation.

Roaming historically trained users to avoid calling because of uncertainty, not just cost. Kolet is trying to reverse that behavior by making every call predictable before it happens.

That’s a subtle but important shift.

Why does this matter more for partners than users

Kolet’s real leverage has never been direct consumer acquisition. It sits inside travel platforms like Air France-KLM, Kiwi.com, Omio, and others.

That’s where this move becomes more interesting.

For B2B2C partners, voice is not a feature. It’s infrastructure for interaction:

• A way to support users without exposing them to roaming
• A way to resolve issues inside the same environment
• A way to stay relevant beyond the moment of purchase

In other words, it extends the relationship beyond “we gave you data.”

That’s a different role in the travel journey.

Where Kolet sits in the market shift

Most travel eSIM providers are still competing on three things: price, coverage, and distribution.

Voice doesn’t fit neatly into that model, so it’s been ignored or outsourced.

At the same time, a different layer of the market is moving in the opposite direction. Infrastructure players like 1GLOBAL or Gigs are building programmable telecom layers where voice, messaging, and identity are native components.

Kolet is not going that deep technically.

But it is moving in that direction conceptually.

It’s taking one step closer to owning the communication layer, without becoming full infrastructure.

That middle position is where a lot of the next phase of the market will play out.

Conclusion: connectivity is tested when things break

Travel connectivity is rarely judged when everything works.

It’s judged in the exact moment something doesn’t.

That’s where most data-only products quietly fail. They assume the user has a fallback. Another SIM. Another app. Another option.

Kolet is trying to remove that assumption.

Not by competing with messaging apps. Not by replacing traditional telecom. But by making sure the user can act, not just connect.

Compared to the rest of the travel eSIM market, this is a more honest view of how connectivity is actually used.

Because in the end, the most important interaction is not scrolling, streaming, or browsing.

It’s that one call you didn’t plan to make.