It's typical in Europe to go abroad on holiday so the only coverage is via expensive roaming - I usually take lots of photos on holiday and like to use my phone

It's typical in Europe to go abroad on holiday so the only coverage is via expensive roaming - I usually take lots of photos on holiday and like to use my phone to play music in my room or by the pool. Hotel WiFi is often expensive. It's especially a problem while cruising - onboard WiFi is slow and expensive, buying a sim per country wastes time.