How much mobile data do you need for a month abroad?

Why a month is not four weeks of holiday

Multiplying a week by four is the obvious shortcut, and it is usually wrong in one direction or the other. On a long stay your habits change. You settle somewhere with Wi-Fi, the evening series moves to the flat, and many days are spent at a desk or a kitchen table rather than walking a city with the map open. That pushes the month below four times a holiday week.

The opposite happens when the place you sleep has no usable Wi-Fi, or when you start working from the phone. Then the habits of home move onto mobile data: video calls, streaming, the laptop syncing in the background. A month like that can be several times the size of the first. So instead of a single number, it is worth building the month out of the kinds of days you will actually have. Our guide on how much data for a week in Europe covers the short version; this one is about the long one.

Count your days by type

• Light days: messages and the odd map, everything else on Wi-Fi. About 100 MB.
• Normal days: maps every day, messaging, a bit of social media. About 300 MB.
• Heavy days: social media all day, uploading photos and stories. About 700 MB.
• Video on top: about 250 MB for half an hour a day, about 900 MB for a couple of hours.
• A laptop on the hotspot multiplies the day by 1.5.

These are the daily figures the data calculator uses, with a 15% margin added at the end for a bad day, and they are explained in how much data do I need. They are estimates of travel habits, not measurements of your phone. The point is to sort your thirty days into these rows: how many at home on Wi-Fi, how many exploring, how many on the move, and on which ones video happens on mobile data rather than on the flat's connection.

Three months, worked out

A stay with good Wi-Fi in the flat. Twenty-two light days at home or at work and eight normal days out exploring: 22 times 100 MB plus 8 times 300 MB, plus the margin, is about 5.2 GB. This is the language course, the month with family or the sabbatical in one city, and it is where people most often overbuy.

A month on the move with no video on mobile data. Thirty normal days of maps, messages and some social media come out at about 10.1 GB in the calculator. Hostels and trains vary in Wi-Fi, so this is a fair baseline for an Interrail summer or a road trip.

The same month with half an hour of video a day on mobile data rises to about 18.5 GB, and with a laptop on the hotspot as well, to about 27.8 GB. The calculator goes up to 30 days, so you can enter your own mix of habits and check these yourself.

Remote work: the calendar outweighs everything

If you work from the phone's connection, the month is decided by video calls, not by email. Using Microsoft's recommended bandwidth for Teams, worked out in our guide to mobile data for remote work, a one-to-one video call is about 1.35 GB an hour, while an audio-only call is about 52 MB an hour.

Over a month the difference is stark. One hour of video calls on each of twenty working days is about 27 GB on its own, before the laptop does anything else. The same twenty hours as audio calls come to about 1 GB. That is why the sensible split for a working month is calls on the flat's or a coworking space's Wi-Fi, mobile data for the rest, and the camera off when the signal is weak. If the laptop does have to live on the hotspot, set its connection as metered first, as the remote work guide explains, and count the 1.5 multiplier in the calculator.

Evenings: series and music over thirty days

Streaming is the other line that grows with time. Netflix says its Automatic setting on a phone gives about 4 hours per GB and Save Data about 6. An hour every evening for a month is therefore about 7.5 GB on Automatic, or about 5 GB on Save Data, as set out in how much data Netflix uses. Disney+ publishes about 2 GB an hour on its default Automatic setting on a phone, so the same habit there would be far larger; see Prime Video and Disney+.

Music is lighter. Spotify's Normal quality works out at about 43 MB an hour, so an hour a day for a month is about 1.3 GB, according to how much data Spotify uses. Downloads made on Wi-Fi cost no mobile data at all, which over a month is the single biggest saving available.

Check after the first week, then top up

Reset your phone's data counter on the day you arrive, as shown in checking data usage on a travel eSIM. After seven days, multiply what you have used by about 4.3 to see where thirty days will land. If the projection is above your plan, either change the habit behind it, usually video or photo backups, or add data before you are close to the end.

With Snoozim, a top-up goes onto the eSIM already installed, with nothing to reinstall, as explained in how to top up a travel eSIM; check the days left on the plan as well as the gigabytes. And do not let it hit zero with data switching to your home line allowed, for the reasons in when your eSIM data runs out. If your home line is from the EU and the month is inside the EU, also read the long-stay check in the EU fair use policy.