TrailSim

Get the eSIM with the best coverage 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 — and on every analysed route, an offline map of its dead zones comes free with your order.

Find my route

Plans from under $5, one-time purchase · Secure Stripe checkout · QR code in minutes · 14-day refund before installation

Two hikers checking their phone on a coastal trail
Where are you headed? Camino FrancésFrance · Spain Ring RoadIceland Route 66United States Browse all 84 routes

Same route, very different signal

61 routes analysed · 47,448 km of trail and road checked · 1,018 dead zones mapped

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

What you carry with you

Page one of the West Highland Way (WHW) coverage report: the coverage map and the segment table Page two of the West Highland Way (WHW) coverage report: the dead-zone list with coordinates

Every analysed route's order includes its coverage report — these pages are the real one for the West Highland Way (WHW). On the trail there is no signal, so it is a PDF you keep on your phone or print, plus a GPX track that puts every dead zone on your map app as you walk.

  • Every stage of the route with its coverage, kilometre by kilometre
  • The strongest network for each stage
  • Every dead zone with its coordinates and GPS waypoints
  • Printable PDF and a GPX track for your GPS or phone map

Included free with every plan on analysed routes, emailed within minutes of purchase.

See your route's report

Frequently asked questions

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?

From public signal data, chosen per route: crowd-sourced cell-tower locations (OpenCellID), US carrier propagation filings from the FCC National Broadband Map, Ofcom's drive-test measurements on some UK roads (Lake District, North Coast 500), and carrier transmitter licences from Australia's ACMA register — mapped onto OpenStreetMap route geometry and sampled every 500 meters for each carrier. Every report states its own source and that it is an estimate, not a guarantee. 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

Public network data, modelled along your exact route — with the eSIM that keeps you connected.

Check my route coverage