How Much Data Do You Actually Need Travelling Abroad?

The most common mistake

The two most common mistakes when choosing a travel data plan are opposite problems: buying far more data than you will ever realistically use, or badly underestimating your needs and running out on day four of a ten-day trip, leaving you scrambling for a top-up with patchy WiFi as your only backup. Both are genuinely avoidable once you have a rough idea of what your actual habits use in practice.

Typical daily usage by activity

Maps and navigation: minimal if you download offline maps before travelling, a five-minute task in both Google Maps and Apple Maps that pays for itself many times over in data savings. Live navigation without offline maps downloaded uses noticeably more, since it's constantly pulling fresh map tiles and traffic data.

Messaging apps (WhatsApp, iMessage): very low — text messages use almost no data at all, and even photo and short video sharing through these apps is modest compared to almost any other activity on this list.

Social media browsing: moderate — an hour of scrolling Instagram or TikTok can use 200-500MB depending on how much video content you view, since auto-playing video is the main data cost here, not the text or static images.

Video calls: significant — a 30-minute video call can use 200-300MB, adding up quickly if you are calling home daily throughout a longer trip, so factor this in specifically if staying in touch via video is a priority for you.

Streaming video (Netflix, YouTube): the heaviest use by far — an hour of standard-definition streaming uses roughly 1GB, with HD using considerably more, sometimes 2-3GB per hour depending on the platform and resolution settings.

A simple rule of thumb

For a typical trip mixing maps, messaging and some social browsing but minimal streaming, budget around 500MB-1GB per day. A week-long trip on that basis needs roughly 3.5-7GB total. If you know you will be streaming or making regular video calls, at least double that estimate to avoid running short partway through.

Download before you fly

Whatever plan you choose, downloading offline maps and any content you might want to watch — via Netflix's download feature, for example, or podcasts and music for offline playback — before you leave the UK meaningfully reduces your data needs once you land. This is genuinely one of the highest-value five-minute tasks you can do before any trip, regardless of which data plan you ultimately choose.

What happens if you do run out

Most travel SIM and eSIM providers allow you to top up your existing plan while abroad, usually through their own app, rather than needing to buy an entirely new plan from scratch. Check this specifically with your chosen provider before you travel, so you know the process in advance rather than figuring it out under time pressure while abroad.

Choosing a plan with the right buffer

Given how easy it is to underestimate genuine usage, particularly on longer trips or when travelling with others who might use your hotspot, it's generally sensible to choose a data allowance with some buffer above your calculated minimum, rather than cutting it precisely to the number you expect to use.

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