Are standard roaming charges applicable in Greece for UK or US SIM cards with CoreESIM?

CoreESIM offers a dedicated data solution, distinct from traditional roaming. If you are using your primary physical SIM card from a UK carrier like O2, EE, or Vodafone UK, or a US carrier, roaming in Greece will incur charges. While EU regulations provide 'Roam Like at Home' for EU-issued SIMs, this typically does not extend to US carriers or UK carriers post-Brexit without specific plan inclusions. CoreESIM bypasses these roaming fees by providing local data access, allowing you to keep your primary SIM active for calls/SMS without unexpected data costs.