What are the potential roaming charges in Portugal for travelers with non-EU SIM cards, like those from the UK or USA?

For travelers outside the EU, particularly from the UK or USA, relying on your home SIM card in Portugal can lead to significant roaming expenses. Post-Brexit, many UK carriers (such as Vodafone UK, O2, and Three) have reintroduced daily roaming fees, which can quickly add up. US carriers like AT&T, Verizon, and T-Mobile often offer international day passes that can be costly for extended stays. WorldESIM provides a more predictable and cost-effective solution, allowing you to enjoy Portugal without unexpected roaming charges.