If I'm visiting Portugal from the UK or US, will my existing SIM card offer free roaming, and how can HotelESIM complement this?

While Portugal is part of the EU, 'Roam Like at Home' benefits typically apply to EU citizens. For visitors from the UK, many carriers (such as O2, Vodafone UK, and Three) have reintroduced daily roaming charges post-Brexit. Similarly, US carriers like AT&T, Verizon, and T-Mobile often charge for international day passes. HotelESIM offers a cost-effective and reliable alternative, providing a dedicated local data connection that works as an excellent primary or backup option to your home SIM, especially if your hotel Wi-Fi is intermittent.