Field notes

The NeoSIM blog

Travel data, eSIM tutorials, and the occasional industry exposé. Written by people who run the network.

eSIM vs traditional roaming: the real 2026 numbers

We pulled 14,000 anonymized billing rows. Here is what travelers actually pay across 6 carriers.

A step-by-step with screenshots. Including the one setting that traps 30% of users.

Maps offline, IC card recharges, JR pass scans. What actually eats your gigabytes.

And why most travel-eSIM brands you see ads for are not actually members.

How distributed-team companies are quietly bleeding money on legacy carrier roaming.

A country-by-country reality check. Spoiler: the marketing maps are optimistic.