Is roaming free in Luxembourg with our UK or US SIM cards?

It really depends on your specific carrier! Since Luxembourg is in the EU, some EU-based SIMs might offer free roaming. However, with Brexit, many UK providers have reintroduced roaming fees. For groups traveling from the USA, Switzerland, or Asia, roaming charges are almost certainly not free and can quickly become very expensive. To avoid bill shock and ensure everyone in your group has affordable, predictable data, a Triply eSIM is a smart choice. It offers clear pricing and dedicated data plans for your trip.