Do UK or US SIM cards offer complimentary roaming in Iceland when using CoreESIM?

CoreESIM provides dedicated local data for Iceland, making traditional roaming concerns irrelevant. However, concerning existing UK or US SIMs, complimentary roaming in Iceland is generally not available. Post-Brexit, most UK carriers, including EE, Vodafone UK, and Three UK, have applied daily roaming charges (typically £2-£6) for Iceland, as it is outside the EU/EEA roaming zone. For US carriers like Verizon or T-Mobile, international roaming is usually managed via specific travel passes or pay-per-use rates, which are often costly. CoreESIM offers a transparent, pre-paid alternative without these roaming surcharges.