There is hardly anything in the world that some man cannot make a little worse and sell a little cheaper.

Whenever you buy a data bundle on a travel eSIM, you’re engaging with a concept called “breakage.” It’s a pricing model where providers rely on customers paying for more data than they actually use.

Bundles come with fixed amounts and expiry dates, and most people either overestimate what they need or don’t use it all in time. The unused data is lost, but still paid for, and that gap becomes pure profit for the provider.

This isn’t accidental. It’s a model built around predictable behaviour. By encouraging upfront purchases and overcommitment, providers create stable margins while managing heavy users with fair usage limits and throttling. In simple terms, it works because most people spend more than they ever actually use.

Data bundles are almost always a false economy.

They’re designed to look cheaper per GB, but that only works if you use every last megabyte within the time limit, which most people don’t. In reality, people overestimate their needs or lose unused data when bundles expire, meaning they pay for more than they actually use. The true cost per GB ends up being far higher than it first appears.

This isn’t by chance. It’s a model refined over years, built around predictable behaviour. Providers know travellers fear running out, so bundle sizes, pricing, and expiry dates are structured to encourage overbuying while still feeling convenient. The result is a system where most people consistently spend more than their real usage would ever require.

Time limits and data expiry are a key part of making the breakage model work. By attaching a countdown to your data, providers introduce pressure that has nothing to do with how much you actually need. Instead of using data naturally, you’re now racing the clock, which often leads to unused data expiring or, just as commonly, buying more “just in case” you run out before the deadline.

This isn’t about convenience, it’s about control. Expiry periods are carefully set to increase the likelihood that some of what you’ve paid for won’t be used, while also triggering that familiar fear of running out at the worst possible moment. The result is a subtle but effective push to spend more than necessary, reinforcing a model where time pressure, not real usage, dictates how much you buy.