You’ve already decided to take data to Mayotte, and now you just need to get the size right: know how many GB to buy for this island in the Mozambique Channel without overspending or running out. Here, I won’t compare roaming, local SIMs, or eSIMs again (you can find that in the destination’s internet guide): I’m going straight to the numbers. Mayotte is small, very untouristy, and its network is still recovering from Cyclone Chido, so the calculation has its own nuances that are worth understanding before choosing a plan.
The quick answer in GB
For 10 days in Mayotte, most travelers will find 3 GB more than enough: the island is small, you'll mainly use maps and WhatsApp, and you'll sleep with Wi-Fi. If you upload many photos or work online, jump to 5-10 GB. Go below 3 GB only if you barely touch your phone.
That's the starting picture, and unless you're an extreme case, you won't stray far from it. Mayotte isn't a destination where you'll spend all day with your phone in hand: you'll need it for navigating the island, sending voice messages and photos via WhatsApp, checking the weather before diving, and not much else. The key is that the actual number depends on three things: how many days you're staying, what type of user you are, and how much Wi-Fi you'll have available at your accommodation. On an island with scarce and mostly French tourism, hotels and gîtes usually have Wi-Fi, which offloads much of the heavy consumption (backups, video, long video calls) from your mobile data plan. If you want the general framework before diving into the details, check out the guide on how much data you need for travel; here, we'll refine the specific figures for this destination.
Why Mayotte changes the calculation
First, an honest clarification that changes the approach: Mayotte is a French overseas department and an outermost region of the EU. This means that, despite being in the Mozambique Channel between Madagascar and the African coast, it counts as European Union territory for roaming purposes. If your Spanish plan includes data in the EU, in theory, it works here just like in mainland France, within your "roam like at home" allowance. It's not like Kenya or Tanzania, which are nearby and would be considered pure foreign territory.
So why look at the GB of an eSIM? For two reasons. One: many plans significantly limit the data you can spend outside your home country even within the EU, with a "fair use" cap that falls short on long trips. Two: if your plan is basic or you're from outside the EU, you'd pay extra here. Buying destination data gives you a fixed figure and control over spending. Either way, the amount of gigabytes you need is the same whether you use your European allowance or buy separately: that's why this calculation works for you either way. You can find the breakdown of connection options in the internet in Mayotte guide.
The network after Cyclone Chido, without hype
Here, it's important to be clear because it affects your decision. In December 2024, Cyclone Chido devastated Mayotte and wiped out many antennas: in the days that followed, mobile coverage dropped by half or more, with many places losing electricity to power the antennas. It was a very serious blow to infrastructure, not a minor blackout.
The good part, and it's real, is that recovery was fast. Within about five weeks, operators had already restored more than 90% of the mobile network, and throughout 2025, population coverage returned practically to normal; 5G was even launched on the island in April 2025, and fiber deployment relaunched. That said, without false optimism: it's still a network under reconstruction, with possible intermittent outages, and the mountainous interior never had great coverage, neither before nor after Chido.
| Area of Mayotte | Data Coverage Today |
|---|---|
| Populated Grande-Terre (Mamoudzou and main towns) | Good, 4G and some 5G |
| Petite-Terre (Dzaoudzi, Pamandzi, airport) | Good, stable coverage |
| Interior and mountains (Mont Choungui) | Weak or none, download maps offline |
| Lagoon, sea, and diving | No signal, zero consumption |
Practical translation for your GB: in the populated areas of Grande-Terre and Petite-Terre, you'll have data normally; in the interior, on Mont Choungui, or sailing in the lagoon, expect to be without a signal. This doesn't make you spend more gigabytes: on the contrary, many hours of your trip simply won't consume data.
How much each activity consumes
Before deciding on figures, it's useful to have a realistic idea of how much each activity consumes. These are the references I use, rounded up so you don't run short. The key: what drives consumption is video and video calls; maps and messaging barely count.
| Activity | Approximate Consumption |
|---|---|
| Maps with GPS (navigating) | ~5 MB per hour |
| WhatsApp: texts and audio | ~10-20 MB per day |
| WhatsApp voice call | ~0.5 MB per minute (~30 MB/hour) |
| Upload a photo (to cloud or chat) | ~3-5 MB per photo |
| Social media (Instagram, TikTok) | ~120-150 MB per hour |
| Video call (WhatsApp, FaceTime) | ~5 MB/min (~300 MB/hour) |
| Music streaming | ~60 MB per hour |
| Video streaming (medium quality) | ~0.7 GB per hour |
| High definition video | ~1.5-3 GB per hour |
Notice the leap: you could navigate with maps for 20 hours and spend the same as 20 minutes of HD video. That's why, in a destination like Mayotte where you'll be diving, on the beach, or in the lagoon for much of the time, actual consumption is usually low. If you want detailed figures by activity, they are in the mobile data usage statistics by activity.
Recommendation by profile and duration
This is the table that really matters. It cross-references four traveler profiles with typical trip durations for Mayotte. These are calculated assuming you sleep with Wi-Fi and leave photo backups and heavy video usage for the night. If you'll also be using mobile data at your accommodation, move up one tier.
| Traveler Profile | 5 Days | 10 Days | 15 Days | 30 Days |
|---|---|---|---|---|
| Maps and WhatsApp (light use) | 1 GB | 3 GB | 3-5 GB | 5-8 GB |
| Photos and social media (medium use) | 3 GB | 5 GB | 8 GB | 15 GB |
| Digital nomad / remote work | 5-8 GB | 10-15 GB | 20 GB | 30 GB+ |
| Sharing with family (multiple phones) | 5 GB | 10 GB | 15 GB | 25-30 GB |
The most common profile in Mayotte, due to the type of trip it is, falls into the first two rows: people who go diving, whale watching, and exploring the island, not Netflix marathons. For them, 3 to 5 GB for ten days is the realistic range. The digital nomad is the only one who needs large packages, and even then, be careful with network stability before committing to long work video calls.
What makes you spend more (or less) here
Mayotte has specific characteristics that tend to drive your data consumption down, not up, and it's good to know them so you don't over-provision your package. As it is French territory, you don't need a camera translator running all day like in Asia: French (and Shimaore) is spoken, so you save on that continuous data expense.
- The lagoon and diving. One of the world's largest lagoons, with humpback whales in season: hours on a boat or underwater where your phone won't consume data. Dead time for your plan, which is good.
- Grande-Terre and Petite-Terre. You'll move between the two islands by barge. The journey is short and has coverage at the jetties, but it's not a source of consumption.
- The interior and Mont Choungui. Trails and rural areas with weak or no signal: you'll download the map beforehand, and that's it. Zero data spent there.
- Little to "consume" online. Scarce tourism, no major taxi or transport apps to check; less screen time than in a big city.
Add all that up, and you'll see why I insist on not overspending: much of your trip passes without consuming a single megabyte. If you still prefer more leeway, you have the guide to Mayotte eSIMs with specific package options.
How to check your own consumption
The tables are a good reference, but the most reliable data you already have in your pocket. The honest trick is this: check how much data you used last month at home and adjust it for your trip. On Android, go to Settings > Network & Internet > SIM > Data usage; on iPhone, go to Settings > Cellular and scroll down to Current Period.
With that monthly number, you can do a quick calculation: divide it by 30 to find your actual daily usage and multiply it by the number of travel days. But correct two things downwards, because you don't consume the same amount of data when traveling as you do at home:
- Remove video and music that you watch via data at home but will watch via hotel Wi-Fi when traveling.
- Subtract the hours of diving, beach, boat, and excursions without signal, which are many in Mayotte.
With that correction, almost everyone discovers that their travel data usage is considerably less than at home. If you normally use 8-10 GB per month with video, in Mayotte, 3-5 GB for ten days will be more than enough. It's the most tedious method, but the only one that truly fits you, rather than a made-up average.
Tips for stretching your data
If you find yourself running low, a few adjustments can give you extra leeway without causing inconvenience. By far the most cost-effective tip is to download maps of the island via Wi-Fi before you leave: Grande-Terre and Petite-Terre in full don't take up much space, and you can navigate without using any data.
- Offline maps for all of Mayotte downloaded from your accommodation. This is the number one trick in an island with areas of no coverage.
- Backups only via Wi-Fi. Don't let your diving photos upload automatically via data: this is what most silently depletes a plan.
- Data saver mode activated on your phone and within each data-heavy app.
- Video and social media on low quality and autoplay disabled on Instagram, TikTok, and YouTube.
- Streaming content downloaded before traveling: offline series and music for the hotel and journeys.
With these habits, a 3 GB plan can perform like a 5 GB plan without you having to constantly monitor it. You can find the complete list in the tips for saving data while traveling. And if you're short on time, prioritize only offline maps and Wi-Fi backups: they account for 80% of the savings with 20% of the effort.
Frequently asked questions
Do I need to buy data if my Spanish plan includes EU roaming?
Not always, because Mayotte counts as EU, but check your cap. As an outermost French region, your European allowance usually applies here. The problem is the "fair use" limit outside your country: on long trips, it can fall short and start charging you. Check your contract before deciding.
How many GB for a week in Mayotte?
2-3 GB is sufficient for 5-7 days of normal use. Maps, WhatsApp, a few photos, and checking the weather barely add up. You'd only need more if you plan to upload many diving videos via data or work online from the island.
Will the internet work well after Cyclone Chido?
Yes, in populated areas; with reservations in the interior. The network was restored over 90% within a few weeks, and by 2025, coverage was almost back to normal, including 5G. Even so, it's a network under reconstruction: there might be occasional outages, and the interior remains weak.
What if I run out of data?
It's better to run short and top up than to overpay in advance. Topping up or buying another package takes minutes from your phone. Buying a huge plan "just in case" almost always results in unused gigabytes, especially in a destination with so much Wi-Fi and so much time without signal.
Will I have coverage while diving or in the lagoon?
No, and that's normal. At sea, underwater, and in much of the lagoon, there's no signal. Download what you need before heading out. The good news for your plan is that these hours won't consume a single megabyte of data.
Is an eSIM worth it for such a short trip?
Yes, if your European roaming doesn't cover it or you want a fixed cost. It activates via QR without changing your physical SIM, and you can control your spending down to the cent. If you don't know how it works, see what an eSIM is before buying.
Do I need data to translate in Mayotte?
Very little: it's French territory. French is spoken, so you won't rely on a camera translator constantly as in Asian destinations. Basic French or occasional offline translations will suffice, saving you continuous data usage.
Can I share data with my family?
Yes, by activating the hotspot from a single phone. For a couple or family, a shared 10 GB plan usually works out better than several small ones. Estimate everyone's combined usage using the per-profile figures from the table above.
Conclusion
To summarize without beating around the bush: for a typical trip to Mayotte of one or ten days, 3 GB is more than enough for most people, and with 5 GB, you'll be comfortable even if you upload photos and use social media. Only if you work online or several people share a connection does it make sense to go up to 10 GB or more. Remember that everything works in your favor here: European roaming might cover you because it's EU territory, there's Wi-Fi in accommodations, and you'll spend many hours diving or in the lagoon without using any data. The network is largely restored after Chido, with caution in the interior.
My advice: don't inflate the package. Start lean, and if you run short, top up in two minutes. Once you're clear, check out our data plan for Mayotte and choose the size that fits your profile. Have a great trip and enjoy the lagoon.
