How many GB of data should you plan for your trip?

Usage matters most. As a rough guide, plan around 500 MB to 1 GB per day for typical use (browsing, messaging, maps, a few photos). GPS and messaging use little. Social media with videos and music streaming add up quickly; HD video is by far the most demanding. For a week of moderate use, a 3 to 5 GB plan is usually enough. And if you are unsure, start small: an eSIM that is still valid can be topped up in seconds, with no reinstall.