Phone signal and eSIMs on France's famous routes
TrailSim has analysed 7 routes that cross France — 2,691 km of them inside France (6,115 km including the parts in neighbouring countries), checked against OpenCellID crowd-sourced tower data. Across those routes, TrailSim's model puts fast 4G/5G data on up to 68% of the distance (whole-route figures; the share is not split at borders), with 43 dead zones of 2 km or more mapped. The best-covered is La Loire à Vélo — Châteaux de la Loire (Orléans–Nantes) (100%); the weakest is GR20 (Grande Randonnée 20 / Fra li Monti) (up to 24%).
France routes with a coverage report
Fast 4G/5G share is the part of the whole route with usable data on the featured plan's networks (a TrailSim model estimate, not a measurement); dead zones are continuous stretches of 2 km or more with no signal on them. The km column is the distance inside France. Every order on these routes includes the report (PDF + GPX).
| Route | km in France | Fast 4G/5G | Dead zones | Dead-zone km | Typical days |
|---|---|---|---|---|---|
| La Loire à Vélo — Châteaux de la Loire (Orléans–Nantes) | 366 | 100% | 0 | 0 | 9 |
| EuroVelo 6 — France (Atlantic–Basel)also crosses Switzerland | 1,017 of 1,022 | 95% | 4 | 39 | 18 |
| Camino de Santiago — Camino Francés (French Way)also crosses Spain | 16 of 768 | 70% | 6 | 78 | 30 |
| EuroVelo 6 (EV6 / Atlantic–Black Sea Route)also crosses Germany, Romania, Serbia, Austria, Hungary, Bulgaria, Slovakia, Switzerland | 1,017 of 3,400 | 61% | 26 | 1,030 | 60 |
| Walker’s Haute Route (Chamonix–Zermatt)†also crosses Switzerland | 16 of 209 | ≤52% | 2 | 83 | 14 |
| Tour du Mont Blanc (TMB)†also crosses Switzerland, Italy | 75 of 166 | ≤42% | 4 | 36 | 8 |
| GR20 (Grande Randonnée 20 / Fra li Monti)† | 184 | ≤24% | 1 | 67 | 9 |
† Mountain estimate from tower positions without terrain modelling — treat as an upper bound.
Frequently asked questions
Which eSIM works best for hiking or driving in France?
It depends on the route: each of France's networks holds in different places, so TrailSim compares them along each route and features the plan whose networks cover the most of it at a sensible price — La Loire à Vélo — Châteaux de la Loire (Orléans–Nantes) is the best-covered of the 7 analysed France routes at 100% fast 4G/5G data (TrailSim estimate). Every France route page lists current plans and, where a report exists, the dead zones with GPS coordinates.
Is there phone signal on hiking trails in France?
Across the 7 France routes TrailSim has analysed (2,691 km inside the country), the model puts fast 4G/5G data on up to 68% of the distance, from up to 24% on GR20 (Grande Randonnée 20 / Fra li Monti) to 100% on La Loire à Vélo — Châteaux de la Loire (Orléans–Nantes). These are estimates from OpenCellID crowd-sourced tower data, not guarantees, and mountain routes are stated as upper bounds; 43 dead zones of 2 km or more are mapped in the route reports.
Do the plan days start when I buy?
No — on first use. Installing the TrailSim eSIM and connecting in France starts the clock, so you can buy weeks ahead. Uninstalled eSIMs can be refunded within 14 days.
All routes · Coverage index (every analysed route ranked) · Glossary · How the analysis works
Estimates from public signal data, not guarantees. Country attribution from the route geometry against Natural Earth borders. Route and place names © OpenStreetMap contributors (ODbL). Updated 2026-09-07. © 2026 TrailSim.