Phone signal and eSIMs on Bulgaria's famous routes
TrailSim has analysed 2 routes that cross Bulgaria — 253 km of them inside Bulgaria (4,860 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 56% of the distance (whole-route figures; the share is not split at borders), with 39 dead zones of 2 km or more mapped. The best-covered is EuroVelo 6 (EV6 / Atlantic–Black Sea Route) (61%); the weakest is EuroVelo 6 — Middle & Lower Danube (Vienna–Black Sea) (43%).
Bulgaria 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 Bulgaria. Every order on these routes includes the report (PDF + GPX).
| Route | km in Bulgaria | Fast 4G/5G | Dead zones | Dead-zone km | Typical days |
|---|---|---|---|---|---|
| EuroVelo 6 (EV6 / Atlantic–Black Sea Route)also crosses France, Germany, Romania, Serbia, Austria, Hungary, Slovakia, Switzerland | 127 of 3,400 | 61% | 26 | 1,030 | 60 |
| EuroVelo 6 — Middle & Lower Danube (Vienna–Black Sea)also crosses Romania, Serbia, Hungary, Slovakia, Austria | 126 of 1,460 | 43% | 13 | 618 | 26 |
Frequently asked questions
Which eSIM works best for hiking or driving in Bulgaria?
It depends on the route: each of Bulgaria'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 — EuroVelo 6 (EV6 / Atlantic–Black Sea Route) is the best-covered of the 2 analysed Bulgaria routes at 61% fast 4G/5G data (TrailSim estimate). Every Bulgaria route page lists current plans and, where a report exists, the dead zones with GPS coordinates.
Is there phone signal on hiking trails in Bulgaria?
Across the 2 Bulgaria routes TrailSim has analysed (253 km inside the country), the model puts fast 4G/5G data on 56% of the distance, from 43% on EuroVelo 6 — Middle & Lower Danube (Vienna–Black Sea) to 61% on EuroVelo 6 (EV6 / Atlantic–Black Sea Route). These are estimates from OpenCellID crowd-sourced tower data, not guarantees; 39 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 Bulgaria 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.