Is roaming in Spain free for UK or US SIM card users, or should I consider WestESIM?

While Spain is an EU member, 'Roam Like at Home' benefits typically apply only to EU citizens. For travelers from the UK, most carriers like O2 or EE have reinstated daily roaming fees (e.g., £2-£6) post-Brexit, making casual usage costly. US providers such as Verizon or AT&T often charge for international day passes ($10-$15) or high per-MB rates. WestESIM offers a superior alternative with clear, upfront pricing for high-speed data across Spain, eliminating unpredictable roaming charges and ensuring seamless connectivity from Madrid to Barcelona.