Is roaming free in Portugal with a UK or US SIM card, or is CheapESIM a better value?

For EU citizens, 'Roam Like at Home' generally applies in Portugal. However, for UK and US travelers, relying on your home SIM can be surprisingly expensive. Post-Brexit, many UK carriers like Vodafone or Three have reintroduced daily roaming fees, typically costing £2-£6 per day, which quickly adds up to £14-£42 for a week. US carriers like AT&T or Verizon often charge $10-$15 for a 'Day Pass' or even higher per-MB rates. CheapESIM offers a predictable, low-cost solution, saving you potentially hundreds of dollars or pounds compared to these daily charges, making it the clear budget-friendly choice.