Is roaming free in the UK with my EU or US SIM card?

Post-Brexit, the concept of 'free roaming' for EU citizens in the UK has changed significantly. While some EU carriers initially maintained free roaming, many have since reintroduced daily roaming charges, often ranging from €2-€6 per day. For US carriers like AT&T or Verizon, the UK is typically considered an international roaming zone, incurring substantial daily fees or high per-MB costs. WestESIM offers a superior alternative with dedicated plans for the UK or broader Western Europe, providing clear, cost-effective data packages on premium networks like Vodafone UK or O2, eliminating the risk of bill shock.