Is roaming free in Bulgaria with my UK or US SIM card, or is HotelESIM a better option?

For travelers from the US, international roaming in Bulgaria will not be free; major US carriers like AT&T or Verizon will charge daily roaming fees. For UK citizens post-Brexit, while Bulgaria is in the EU, many UK carriers (e.g., O2, Vodafone, Three) have reintroduced daily roaming charges, typically £2-£6 per day. HotelESIM offers a straightforward, cost-effective solution for data connectivity, allowing you to enjoy your Bulgarian experience without worrying about unexpected charges from your home network, making it a reliable backup to your hotel's Wi-Fi.