What are the typical roaming costs for UK or US SIM cards when operating in Portugal, and how does DataESIM compare?

For non-EU SIM cards, roaming charges in Portugal can be substantial. Post-Brexit, many UK carriers (e.g., Vodafone UK, O2, Three) have re-implemented daily roaming fees, often ranging from £2 to £6, which can quickly accumulate. US carriers (e.g., AT&T, Verizon, T-Mobile) typically offer international day passes at $10-$15 per day, or charge per MB, which is unsustainable for heavy data consumption. DataESIM provides transparent, high-volume data plans specifically designed for international use, eliminating unpredictable roaming fees and offering a cost-effective solution for consistent, high-speed connectivity without daily limits.