Are international roaming fees applicable in Bulgaria for UK or US SIM cards with DataESIM?

The applicability of roaming fees in Bulgaria for UK or US SIM cards depends on your citizenship and carrier policy. For EU citizens, the 'Roam Like at Home' directive applies. However, for UK citizens post-Brexit, most UK carriers (e.g., O2, Vodafone, Three) have reinstated daily roaming charges (typically £2-£6). US carriers (e.g., AT&T, T-Mobile) will impose their standard international roaming fees. DataESIM, being an independent data solution, completely circumvents these roaming complexities and costs, providing dedicated, high-volume data for Bulgaria.