How Many GB Do I Need for French Guiana? A Travel Profile Guide

If you already have your flight to Cayenne and you just need to decide how many GB to buy for French Guiana, I'll start with what almost no one tells you: even though it's next to Brazil and Suriname, French Guiana is an overseas French department and an outermost region of the European Union. This means that your Spanish EU tariff usually works there just like in Madrid, without surcharges, even though you're 7,000 km away. It's not a Caribbean island with outrageous rates: it's the EU in the middle of the Amazon rainforest. From there, the question of gigabytes changes significantly, and there's a border detail that can cost you money.

The short answer: the GB you need

For 10 days in French Guiana, most travelers will have more than enough with 5 GB. With maps, WhatsApp, some social media, and uploading photos every night, you'll hardly exceed that. If you work remotely or make daily video calls, count on 20 GB. If you're only going to Cayenne and Kourou for 5 days, 3 GB will suffice.

That's the figure, and there's no need to overthink it. However, Guiana has three things that push the number down and one that pushes it up, and it's worth understanding them before paying.

Downward: a good part of the trip takes place in areas without coverage (the jungle, rivers, multi-day excursions), where the phone consumes nothing because there's simply no network. Accommodations in Cayenne and Kourou usually have Wi-Fi, and a large part of the day you're on the road or on a boat, not on Instagram. Furthermore, being French territory, you don't need a camera translator running all the time as in Asia: signs are in French and the euro is the currency, so you save on a currency converter and half an ecosystem of local payment apps.

Upward: if you're going to watch a launch at the Guiana Space Centre, that day will see a spike in data usage. People record the entire countdown, upload it, send it via WhatsApp, and make video calls to half the family. A single launch day can consume more data than the previous four combined. If that's your plan, add between 1 and 2 GB extra just for that day and rest easy.

Why French Guiana doesn't spend like the rest of South America

Many people calculate their gigabytes for Guiana as if it were Brazil or Suriname, and they're wrong in both directions. French Guiana is not an independent country: it's a full-fledged French department, with a prefecture, euros, gendarmerie, and telephone code +594. And, as an outermost region of the EU, it is on the list of territories where European tariffs apply without surcharge. Movistar, Orange, Vodafone, MásMóvil, Simyo and co. include it within their European zone along with Martinique, Guadeloupe, Saint Martin, Reunion, and Mayotte. It's unusual, but it's true.

The practical consequence: if you have a normal Spanish tariff, you probably already have data there without paying extra. I'm telling you this even though I sell data packages, because I prefer you to check your case rather than get a nasty surprise. Now, two honest caveats. The first: European roaming has fair usage policies, and many tariffs give you considerably fewer gigabytes outside Spain than within; it's worth checking the exact limit of your contract before assuming you have 100 GB in Cayenne. The second: not all operators treat overseas territories equally, and some low-cost tariffs expressly exclude them from zone 1. A message to your operator before flying will save you a surprise.

If your tariff doesn't cover overseas territories, or if you're traveling from outside the EU, that's where buying local data makes sense. In internet in French Guiana I compare the options one by one; here we continue with the gigabytes.

Maroni and Oyapock Rivers: the network jump that you do pay for

This is the section that can save you the most money, so read it even if you skip the rest. Guiana borders Suriname to the west along the Maroni River and Brazil to the east along the Oyapock River. In Saint-Laurent-du-Maroni and Saint-Georges-de-l'Oyapock, the other bank is literally a few hundred meters away, and the antennas of Suriname and Brazil reach without problem. Your mobile doesn't know about borders: it connects to the strongest signal.

And there's the problem. Suriname and Brazil are not the European Union. If your phone jumps to Telesur or Digicel Suriname while you're waiting for the dugout canoe, or to Vivo, Claro, or TIM when crossing to Oiapoque, those megabytes are billed separately at international zone prices, which is where bills get ugly. The same goes if you take a dugout canoe excursion on the Maroni: half the journey you'll be on the Surinamese network.

In the two border towns, go into your phone's network settings, turn off automatic operator selection, and manually choose a Guianan network. It takes a minute and will protect you against surprise bills.

How much each thing you'll do there actually consumes

Gigabytes become much less abstract when you translate them into hours of use. These are the figures I work with, rounded and on the conservative side (i.e., overestimating, not underestimating):

Notice the pattern: maps and messaging are pocket change, and video eats everything. A tourist who doesn't watch video on the street rarely exceeds 300 MB per day, even using their phone constantly. I have the detailed breakdown in mobile data usage statistics by activity, if you want to fine-tune it to your own habits instead of an average.

Kourou, Ariane, and the day you'll burn the most data

The Guiana Space Centre is Europe's spaceport: Ariane and Vega rockets have been launching from there for over forty years, and it's about 60 km from Cayenne, between 45 minutes and an hour by road. The guided tour of the center can be done for free by booking in advance, and it includes the Jupiter room, from where launches are monitored. That, in itself, consumes little: photos, a voice note or two, and little else.

What skyrockets consumption is the launch day. If you coincide with one, you'll be at an observation point for hours with your phone in hand: live countdown, long video, stories, sending everything via WhatsApp, and a video call to your people so they can watch it with you. It's one of the few travel experiences people record in their entirety. And on top of that, with thousands of people in the same area, the network is slow, so the phone retries uploads and consumes even more.

Practical translation: a launch is equivalent to four or five normal travel days. If your calendar coincides with one, go up a notch in the package you were going to buy.

90% of the territory without coverage: you spend less than you think

French Guiana is Amazon rainforest over 90% of its surface, and almost all the population lives in a narrow coastal strip. Mobile coverage follows exactly that map: reasonable 4G in Cayenne, Kourou, Matoury, Sinnamary, and Saint-Laurent-du-Maroni, patchy signal in inland villages, and in most of the territory, nothing at all. Excursions to jungle carbets, trips up the Maroni, or days in nature reserves occur without network.

This has two consequences, one good and one bad. The good, for your wallet: nature days are zero-consumption days, and on a typical one or two-week trip, there can be three or four. That's why Guiana needs fewer gigabytes than an equivalent urban trip in, say, Argentina or Mexico.

The bad: if you don't have anything downloaded, you'll be blind precisely when you need it most. Before leaving Cayenne, download the offline map of the entire coastal strip and the areas you'll be visiting (in Google Maps you do this from your profile, "Offline maps"), save reservations and tickets to your mobile, and download music and podcasts for car and boat journeys. There's no practical public transport between municipalities here, so you'll be doing a fair few kilometers on the RN1 and you'll appreciate having entertainment loaded. Downloading beforehand is free; doing it on the go costs megabytes.

Recommendation by profile and trip duration

This is the table that really matters. Find your row, find your days, and buy that package. They are calculated with a margin, assuming some days you won't touch Wi-Fi and others you won't even have coverage.

A couple of fine adjustments. If you're going to Saint-Laurent-du-Maroni or Saint-Georges and plan to cross into Suriname or Brazil even for a day, don't try to cover it with the Guiana package: it's not valid there. Either go without data that day, or purchase separate coverage for the neighboring country. And if you always stay in hotels and apartments in Cayenne with decent Wi-Fi, you can safely go down a tier: the accommodation Wi-Fi will cover your backups and evening video watching.

If you're going to combine Guiana with Suriname, Brazil, or the French Caribbean, first check the general calculation of how much data you need for travel, because the distribution among countries changes the calculations quite a bit.

How to calculate your real consumption before leaving home

All the tables in the world are worth less than your own data. And you have it in your pocket. On Android: Settings > Network & internet > SIM > Data usage, and check the last full month. On iPhone: Settings > Mobile Data, with details by application (remember to reset statistics occasionally, because otherwise they accumulate since you bought the phone).

With that number, the rule I use is simple: take your monthly gigabytes, divide by 30 to get your daily average, and multiply by the number of travel days. Then adjust:

• Subtract 30-40% if at home you consume a lot of video on the couch with mobile data, because you won't have that downtime while traveling.
• Subtract days without coverage: jungle, river, or sailing days count as zero.
• Add 20% if traveling with children, because the mobile often becomes cartoons in the car.
• Add 1-2 GB if you coincide with a launch.
• Add 15% for a buffer, and that's it. No more margin is needed.

A real example of how the calculation works out: someone who spends 12 GB a month in Spain uses 400 MB a day; in 10 days in Guiana, that would be 4 GB, minus three days without coverage and minus the video you won't watch there, it becomes just over 2 GB, and with a buffer, you round up to 3 GB. This matches the table in the previous section, and that's why I trust it. Your last month's history is the best advisor you'll find, much better than any online calculator.

Tips to stretch your gigabytes in Guiana

With these adjustments, made in five minutes before flying, a small package performs like a medium one:

• Offline maps of the entire coast, from Saint-Laurent to Saint-Georges. This is the biggest saving and provides the most peace of mind on the road.
• Backups only via Wi-Fi. In Google Photos and iCloud, disable uploading with mobile data. This is what silently eats up data packages: you upload 200 photos from the Salvation Islands without even realizing it.
• Data saver mode activated (Android and iOS have it by default), which limits what apps do in the background.
• Auto-play video disabled on Instagram, TikTok, X, and Facebook. That's half of social media data usage.
• Video quality set to 480p and music downloaded at home.
• App updates only over Wi-Fi, or one afternoon you'll eat up 800 MB of updates in the middle of Kourou.
• Video calls over accommodation Wi-Fi, and if you have to make them elsewhere, a voice call is better: it consumes twenty times less.

And a specific tip for this destination: on long excursions, activate airplane mode when you're out of coverage. A phone searching for a network it can't find doesn't consume data, but it drains battery like crazy, and there are no outlets in the jungle. Arriving at the end of the day with battery is worth more than any gigabyte. If you want the complete list, I have it in tips to save data while traveling.

What happens if you run short (and why it's okay)

Let me be clear: it's better to buy too little and top up than to buy too much just in case. Unused gigabytes are not refunded, and in a destination where you'll spend whole days without coverage, overspending is a waste of money. Running short, on the other hand, can be fixed in two minutes from your phone, as long as you have a signal and a card handy.

The perfect plan is not the one you have leftover: it's the one that runs out on the last day of your trip. If you come back with 8 GB unused, you haven't protected yourself, you've overpaid.

If you find yourself running low halfway through your trip, you have three options before spending another euro. The first is to cut down on video streaming when you're out and about: that's where most of your data goes. The second is to rely on your accommodation's Wi-Fi for heavy usage, which in Cayenne and Kourou usually works reasonably well. The third is to top up; and do it while you still have some megabytes left, not when you're at zero, because you need a connection to top up. That's the only truly serious mistake with travel data: running out of data in Saint-Georges and not even being able to buy more.

And a word of caution for this particular destination: don't assume you'll be able to top up everywhere. Outside the coastal strip, there's no network, and in some inland villages, the signal comes and goes. Always leave a small margin before heading into the jungle. If you've never used digital travel data and are wondering how all this works, I explain it from scratch in what an eSIM is.

Frequently asked questions

The most common questions I get about mobile data in Guiana, answered concisely. If yours isn't here, write to me and I'll add it.

Conclusion

In summary, if you only read this last part: 5 GB for ten days covers almost everyone in French Guiana, 3 GB is enough for a short trip with maps and messaging, and 20 GB is for those who telework. Add 1-2 GB if you're going to a launch. It's a low-consumption destination because the jungle, which is most of the territory, has no coverage, and because coastal accommodations have Wi-Fi.

Before buying, make two checks that are worth money: see if your Spanish plan includes the French overseas territories (many do, and then you might not need anything) and, if you're going to border cities, manually set the network so your mobile doesn't roam to Suriname or Brazil. With that, and with downloaded maps, you won't have any nasty surprises.

And if your plan doesn't cover French Guiana or you're traveling from outside the EU, activate your data before you take off and forget about looking for a store when you land: here's the eSIM guide for French Guiana and here, directly, the eSIM for French Guiana with the size you've chosen from the table. Choose the small package, top up if necessary, and spend your trip looking at the jungle instead of your screen.

Written by Marc González Sáez Founder of PuraSim and a specialist in eSIM and connectivity for travelers. He has been helping people travel connected worldwide for years without overpaying for roaming, and personally tests eSIMs in each destination before recommending them.