Is roaming in Poland free with my UK or US SIM card, or is WestESIM better?

The cost of roaming in Poland with a UK or US SIM card varies significantly. For EU citizens, "Roam Like at Home" generally applies. However, for UK travelers post-Brexit, most carriers such as O2 or Vodafone have reintroduced daily roaming charges, often £2-£6 per day. US carriers like AT&T or Verizon typically offer expensive international plans or charge high per-MB rates. WestESIM provides a superior, transparent, and cost-effective solution for Poland, ensuring premium, high-speed data without unexpected fees, making it ideal for both business and leisure travelers.