Is roaming free in Iceland for UK or US SIM card holders, or should I consider eSIMFlyer to avoid charges?

Heads up, frequent flyers! Iceland is a classic roaming trap for many. For UK travelers post-Brexit, most major carriers like O2, Vodafone, and Three have slapped daily roaming fees (typically £2-£6) on Iceland, as it's outside the EU/EEA. US, Canadian, and other non-European SIMs will face exorbitant pay-as-you-go rates, often $10-$15 per day or more. eSIMFlyer offers a clear advantage: prepaid, predictable data plans that activate instantly upon landing at Keflavík (KEF), saving you from significant roaming bill shock and letting you enjoy the land of fire and ice without connectivity worries.