Will it work inside the Wieliczka Salt Mine?

The ETravelSim Poland eSIM works at the Wieliczka Salt Mine entrance, ticket office, and visitor centre with strong 4G coverage. Inside the mine itself there is no mobile signal anywhere — the underground depth blocks every Polish carrier and is universal worldwide for deep mines. Tour guides communicate via radio because no consumer cellular reaches 135 metres below ground. Buy tickets, download tour information, and message your group before descending the lift. The same applies to other underground attractions like the Krakow Salt Mine of Bochnia.