TrailSim

Get the eSIM with the best signal on your route

Walking the Camino? Driving Iceland's Ring Road? TrailSim compares carrier coverage along your exact route and tells you which eSIM keeps you connected — plus an offline map of every dead zone, free with your order.

Find the eSIM for my route

Two hikers checking their phone on a coastal trail

Same route, very different signal

A real-world modeled comparison along the 768 km Camino de Santiago. Both maps show the exact same route at the same scale, so you can see where each carrier becomes weak or disappears completely.

Vodafone

59% of the route with any signal

Vodafone coverage along the Camino de Santiago, with route sections colored by 4G or 5G, 2G or 3G, and no signal
4G / 5G
41%
2G / 3G
18%
No signal
41%

Movistar

86% of the route with any signal

Movistar coverage along the Camino de Santiago, with route sections colored by 4G or 5G, 2G or 3G, and no signal
4G / 5G
59%
2G / 3G
27%
No signal
14%
4G / 5G data 2G / 3G only No signal

Why not just any travel eSIM?

Generic travel eSIM

  • Sold by country, not by route
  • Coverage map = the whole nation
  • You find the dead zones the hard way

TrailSim

  • Matched to your exact route
  • Segment-by-segment coverage comparison
  • Offline dead-zone map included

Local SIM on arrival

  • Airport queues and language barriers
  • Might be the wrong carrier for your trail
  • No coverage info for remote sections

Frequently asked questions

What is TrailSim?

TrailSim recommends the eSIM with the best signal for your specific hiking, cycling or road-trip route, modeled segment by segment from real cell-tower data. Every order includes an offline coverage map (GPX/PDF) marking the dead zones along your route.

Who is behind TrailSim?

TrailSim is independently built and run by one developer — James Moore, a long-distance hiker who wanted honest signal data for trails. Payments are processed by Stripe and appear on your card statement as TRAILSIM, and refunds are self-service within 14 days for uninstalled eSIMs. More on the about page.

Where does the coverage data come from?

TrailSim models coverage from open data: the route geometry from OpenStreetMap and real cell-tower locations from OpenCellID, sampled every 500 meters along the route for each carrier's network. It is an estimate, not a field measurement — and every report says so plainly. See how it works.

Does my phone support eSIM?

Most phones released since 2019 support eSIM, including iPhone XS and later, Google Pixel 3 and later, and most recent Samsung Galaxy models. Your phone must also be carrier-unlocked.

What is the offline dead-zone map?

A GPX and PDF map of your route with signal, weak-signal and no-signal sections marked. It works fully offline in apps like Gaia GPS, Komoot or Organic Maps.

Know your signal before you go

Real coverage, modeled along your exact route — with the eSIM that keeps you connected.

Find the eSIM for my route