The most efficient and cost-effective way to get Wi-Fi (mobile data) in Europe in 2026 is by using a Regional Europe eSIM. Services like Airalo, Sim Local, or Holafly allow you to download a digital SIM card to your phone before you even leave home. These eSIMs provide access to local networks (like Orange, EE, or Vodafone) across the entire EU and UK, often with unlimited data plans for a flat fee, which is significantly cheaper than the $10–$15 per day roaming charges from U.S. providers. If your phone is older and doesn't support eSIMs, you can buy a physical Prepaid SIM at any European airport, though this wastes valuable vacation time in lines. For those traveling in groups or needing to work remotely, a Portable Wi-Fi Hotspot (like a Solis or Skyroam) is an excellent alternative, allowing up to five devices to connect simultaneously. Finally, while most European cafes and hotels offer free public Wi-Fi, it is highly recommended to use a VPN to protect your data while on these unencrypted networks.