Stay Connected in Cascais

Cascais is, for whatever reason, one of the easier places in Europe to stay connected. You're 30 minutes from Lisbon. The coastline has been wired for affluent expats and remote workers for years, so 4G coverage holds up across town, the train line, and most beaches from Carcavelos through to Guincho. 5G covers the centre and Avenida Marginal. Coverage isn't the surprise. The EU roaming rules are: if your home plan comes from another EU country, you likely already have free roaming and don't need to do anything. Visitors from the US, UK, Canada, and elsewhere need a plan. Public WiFi is everywhere, including the Cascais train station, most cafes along Rua Frederico Arouca, and the larger hotels, though speeds at peak beach hours can crawl. One frustrating bit. Signal can dip briefly inside the older stone buildings in the historic centre.

Portugal has three major mobile networks. All three reach Cascais well: MEO (the incumbent, owned by Altice), Vodafone Portugal, and NOS. MEO has the deepest coverage along the Linha de Cascais train corridor and into the Sintra-Cascais Natural Park, which matters if you're hiking to Cabo da Roca or Guincho. Vodafone wins on speed. Its 5G in the town centre comfortably handles video calls and tethering. NOS competes on price and works well enough across the urban core, though coverage thins in the more remote stretches of the Serra de Sintra. Real-world 4G speeds in Cascais sit in a healthy range for streaming and navigation. 5G in the centre runs noticeably faster when you need to upload photos or join a work call. Inside Boca do Inferno's rocky cliffs or in the beach coves, expect brief dropouts. Fair warning.

WiFi in Cascais is plentiful and mostly fine. The usual cautions apply. Hotel networks, the WiFi at Lisbon Airport, and the cafes around Largo Luis de Camoes are all open or lightly secured, which means anyone else on the network can potentially see unencrypted traffic. Travelers make easy targets. They tend to log into bank apps, email, and booking sites from networks they'd never trust at home. A VPN encrypts everything between your device and its server, so even on a sketchy cafe network, your traffic is unreadable to anyone snooping. NordVPN is one option that works reliably in Portugal. Run it whenever you're on public WiFi, above all for anything financial. If you can't use a VPN, at least stick to your cellular data for sensitive logins. Most modern apps use HTTPS, which helps. It's not a substitute.