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Eligible EU and EEA plans generally allow temporary roaming under the European framework, subject to fair-use conditions and the contract. Do not assume that every unlimited domestic package means unlimited roaming data. A UK or another non-EU SIM may include Spain voluntarily or may charge extra; the individual tariff decides. Check the provider’s current destination list and spending controls.

If you choose a local SIM or travel eSIM, confirm that your phone is unlocked and compatible before paying. Read when the package starts, how long it lasts, whether it includes a telephone number and whether calls or only data are supplied. Keep the installation instructions accessible on another screen or offline so you are not trying to solve setup without a connection.

Onboard mobile services may use a satellite network rather than the land network you expect. The EU’s ordinary regulated roaming rules do not apply to those satellite services. Disable roaming or use flight mode when appropriate, and read any onboard Wi-Fi terms separately. Do not assume that seeing a familiar provider name guarantees your usual rate during a sea crossing.

Coverage also depends on the exact place. A remote beach, rural road or mountain trail is not the same as a city centre. Ask your accommodation about its connection if working online is essential, and avoid planning an important call around an untested public network.

Download maps for the next area, save tickets and write down the accommodation address and contact number. Keep enough battery for a travel day and protect account access with strong authentication. Use a connection you trust for sensitive transactions. Your Diary should help when reception is poor, so make a small offline pack before changing bases instead of relying on every link opening at the moment you need it.