How TrailSim works
Where our coverage data comes from, how we pick your eSIM, and what's in the offline map.
1. Where the data comes from
We compile two kinds of sources for every route: the coverage maps that carriers publish for their own networks, and community coverage reports from hikers, cyclists and drivers who have traveled the route. We do not claim to have field-tested every kilometer — where data is thin, your report says so honestly.
Public carrier coverage data
Official coverage maps published by the carriers operating along your route, including the roaming partners your eSIM would actually use.
Community reports
Signal reports from travelers on the route — trail forums, GPS communities and our own users — used to confirm or challenge what the official maps claim.
2. How we compare carriers on your route
A country-level coverage percentage means nothing on a trail. We split your route into segments (typically 5–20 km), and for each segment record which carriers have usable signal, weak signal or nothing. The eSIM we recommend is the one whose network — or partner network — covers the most of your route, weighted toward the remote sections where being reachable matters most.
3. The offline dead-zone map
Every order includes your route as a GPX file and a printable PDF, with each segment colored by expected signal. Load it into Gaia GPS, Komoot or Organic Maps — it works with no connection at all, which is rather the point.
Before you set off, you know exactly where to download offline maps, where to send the "I'll be unreachable until Thursday" message, and where signal comes back.
4. Installing your eSIM
Check compatibility
Most phones since 2019 support eSIM (iPhone XS+, Pixel 3+, recent Galaxy). Your phone must be carrier-unlocked.
Scan the QR code
We email your eSIM QR code. Scan it in your phone settings over Wi-Fi before you travel — it takes about two minutes.
Turn it on when you land
Enable the eSIM line and data roaming on arrival. No kiosks, no paperwork, no swapping tiny plastic trays at the airport.
Keep your home number
Your physical SIM stays in place for calls and texts; the eSIM handles data on the trail.
Ready to see your route?
Tell us where you're headed and we'll send the coverage report for it.
Check my route