You have your flight to Athens, two or three islands picked out, and a ferry booked, and now you're wondering how many GB you need for your trip to Greece without getting stranded in the middle of the Aegean. Before we get to the number, the uncomfortable truth: Greece is part of the European Union, so if you have a Spanish data plan, your data already covers you there without paying an extra cent. This guide doesn't exist to sell you data you don't need. It exists for those who don't have a European plan, for those whose plan is ridiculous, for those traveling from outside the EU, and for those who simply want to know how much data an island-hopping trip with a thousand photos actually consumes.
Before the number: Greece is in the EU, and that changes everything
For 10 days in Greece, most people will find 3 GB to be plenty. But before buying anything: Greece is in the EU, so with a Spanish plan, roaming already covers you without extra charges. This guide is for you if you don't have a European plan, if yours is very limited, or if you're traveling from outside the EU.
I'd rather tell you in the first paragraph, even if it costs me a sale. Greece is subject to the European roaming regulation, the famous "Roam Like at Home," extended until 2032: you use your gigabytes in Naxos just like in Albacete, with your usual plan and no surcharges. If that works for you, you can close this tab now.
That said, there are four very real situations where the number does matter:
- Your European allowance might be tiny. The regulations allow operators to limit roaming data with a formula tied to the price of your plan. As of January 2026, the European wholesale reference is €1.10/GB, and the limit is calculated by dividing the monthly price of your plan before tax by that figure and multiplying by two. With a €12/month plan, that's about 18 GB; with a €6 plan, about 9 GB; with a cheap prepaid plan, significantly less.
- Some plans simply don't include data outside of Spain, especially low-cost prepaid plans and some business lines. In those cases, every megabyte is charged separately.
- If you exceed the limit, you're charged for the excess: just over €1 per GB. It's not ruinous, but it's not free either.
- You're coming from outside the EU. From the UK, Latin America, or the United States, roaming in Greece is still expensive, and that's when you'll need to buy data.
If you want to compare connection options before deciding on the size, I've broken it down in the guide to internet in Greece. Here, we're going straight to gigabytes.
How much data each app you'll use actually consumes
Most people make mistakes when calculating because they think of "using their phone" as if everything consumed the same amount. That's not the case: there's a hundredfold difference between looking at a map and watching a Reel. These are the figures I use, rounded and on the conservative side.
| Activity | Approximate Consumption |
|---|---|
| WhatsApp, text messages only (100 messages) | less than 1 MB |
| WhatsApp voice call | 0.5-1 MB per minute (30-60 MB/hour) |
| Video call | 5-12 MB per minute (300-700 MB/hour) |
| Google Maps navigating with data | 3-5 MB per hour |
| Google Maps with map already downloaded | practically 0 |
| Searching for a restaurant, reading websites, checking ferry schedules | 10-20 MB per 15 minutes |
| Instagram or TikTok, scrolling through videos | 300-800 MB per hour |
| Uploading a photo from your camera roll | 3-5 MB per photo |
| Posting a story | 5-10 MB |
| Uploading a 1-minute video | 60-100 MB at 1080p, up to 350 MB at 4K |
| Spotify at normal quality | around 72 MB per hour |
| Spotify at high quality | around 145 MB per hour |
| YouTube or Netflix at 480p | 250-300 MB per hour |
| YouTube or Netflix at 1080p | 1.5-2 GB per hour |
| Translator with camera (per query) | 1-2 MB (0 if Greek is downloaded) |
The conclusion is obvious: maps and messaging aren't the problem. The problem is video, in both directions: what you consume lying on the beach and what you upload. If you want the long detail of these measurements, I've compiled them in the data usage statistics by activity.
Why you'll spend less data in Greece than you think
Greece is, of the destinations I cover, one that requires the least data. There are three very specific reasons, and they all work in your favor.
First: Wi-Fi is everywhere. Hotels, apartments, family studios, cafes, port tavernas, and even many beach bars offer free Wi-Fi. On a typical trip, you sleep in a place with Wi-Fi, have breakfast in another with Wi-Fi, and have dinner in a third with Wi-Fi. This means that large downloads—uploading the day's camera roll, updating apps, loading a series—don't have to touch your gigabytes.
Second: You'll spend hours without decent coverage and, therefore, without spending data. On long inter-island crossings, the signal disappears for much of the journey, and on the beaches of southern Crete or the coves of Amorgos, you won't be using data either.
Third: The Greek trip is done off-mobile. Beach, umbrella, long dinner by the sea. It's not a destination for being glued to your screen.
In Greece, the enemy of your gigabytes isn't the map or WhatsApp. It's the automatic backup uploading 180 photos of Oia while you're calmly having dinner.
The honest nuance: in August and on small islands, that abundant Wi-Fi gets saturated. A hundred people connected to the same taverna router is enough for WhatsApp, not for uploading videos. Account for that and don't take everything for granted.
And why it can skyrocket: Santorini photos and videos
Now the other side. Greece is probably the European destination where you'll take the most photos per day of travel. The sunset in Oia, the blue domes, the windmills of Mykonos, the Acropolis at dusk, the impossible water of Milos. People return with 1,000 or 1,500 photos from ten days, and that's where the real consumption lies.
Do the math with me. A modern phone photo weighs between 3 and 5 MB. If you have automatic backup enabled on iCloud or Google Photos and don't limit it to Wi-Fi, 120 daily photos are between 350 and 600 MB per day uploading without you even realizing it. Add a couple of one-minute vertical 4K videos, and you're at 1 GB daily just for uploads.
The same goes for stories. Ten stories a day are about 80 MB, not much; but if you also spend half an hour looking at other people's, there goes another 200-300 MB.
My recommendation is simple: set backup to "Wi-Fi only" and upload your camera roll each night from the hotel. You gain three things: you don't spend data, you don't drain your battery outdoors, and photos upload faster. If you still want to post live from the caldera of Santorini, budget an extra 300-500 MB per day and buy accordingly.
Island hopping: long ferries and patchy coverage
If your trip is Athens plus two or three islands, you'll spend many hours on a ferry. And the ferry changes the data calculation in a way that almost no one tells you about.
The Cyclades are relatively close together, and antennas are usually high up, so on short crossings, you'll maintain signal for most of the way. But on long routes—Piraeus to Santorini is between 5 and 8 hours on a conventional ferry, slightly less on a fast one—you'll have coverage when leaving port and approaching your destination, and in between there are long stretches where your phone will lose signal. On such journeys, it's normal to lose signal for a significant part of the crossing.
This has two interpretations. The good: those hours don't consume data, so an itinerary with a lot of boat travel consumes less than it seems. The bad: those are precisely the hours when you'd want to entertain yourself with your phone.
What I do before boarding, always using the port or hotel Wi-Fi:
- Download chapters or a playlist for the journey.
- Save the ferry ticket to your phone, as a PDF or screenshot. Don't rely on opening an email in the open sea.
- Download the offline map of the destination island.
- Send pending messages and let people know you'll be unreachable for a few hours.
Large ships usually offer Wi-Fi on board, but expect it to be slow and with many people connected: it's enough for messaging, not for video calls or streaming.
Driving around the islands and deciphering the Greek alphabet
Two Greek peculiarities that do move your data needle, and both are solved by downloading things beforehand.
The rental car. In Crete, Naxos, Rhodes, Corfu, or Kefalonia, it's normal to rent a car or quad, and the inland roads are narrow, with sharp turns and serious gradients. You'll be using GPS for hours. The good news is that Google Maps navigation consumes very little, between 3 and 5 MB per hour. The bad news is that in gorges and inland valleys, coverage can fail, and getting lost without a map on a Greek mountain road is not fun. Download the offline map of the entire island before you go: it weighs between 50 and 150 MB via Wi-Fi, and in return, navigation consumes practically nothing and works without a signal.
The alphabet. Main roads have transliterated signs in the Latin alphabet, but village taverna menus, handwritten bus schedules, and shop signs are in Greek. A camera translator helps, and it consumes 1-2 MB per query if you use data. Download the Greek package for offline use, and those queries will cost nothing.
For getting around, taxi apps work in Athens; on the islands, you still call a taxi or pick one up at the port stand. And on the Athens metro, inside the tunnel, there's no data to be had.
How many GB you need based on your profile and number of days
This is the table you came looking for. It's calculated assuming what actually happens in Greece: you sleep in a place with Wi-Fi, eat dinner in a place with Wi-Fi, and spend hours on boats and beaches without coverage. All figures include a reasonable safety margin.
| Traveler Profile | 5 Days | 10 Days | 15 Days | 30 Days |
|---|---|---|---|---|
| Map and WhatsApp tourist (hotel Wi-Fi) | 2 GB | 3 GB | 4 GB | 8 GB |
| Photos and social media (daily stories, evening scroll) | 3 GB | 5 GB | 8 GB | 15 GB |
| Island hopper (3-5 islands, lots of ferries, lots of photos) | 3 GB | 6 GB | 10 GB | 18 GB |
| Digital nomad or remote work (video calls) | 10 GB | 20 GB | 30 GB | 50 GB or unlimited |
| Family sharing data (2-4 phones) | 5 GB | 10 GB | 15 GB | 30 GB |
Three caveats about this table. One: if the hotel has decent Wi-Fi, the top row will be more than enough; I've seen many people return from two weeks in the Cyclades having used less than 2 GB. Two: the family row assumes one phone shares connection with the others, which is usually what happens; if everyone goes their own way, multiply the first row by the number of phones. Three: the remote work row is the only one that can genuinely fall short, because one hour of daily video calls is already 10-20 GB per month.
If you're traveling to multiple countries on the same trip, I cover the general criteria in the guide on how much data I need for travel.
How to calculate your real consumption in five minutes
Tables are good, but you have a much better data point: what you actually spend each month. Look it up before you buy anything.
On an iPhone, go to Settings and then Mobile Data: you'll see the accumulated usage and the breakdown by app. On Android, go to Settings, Connections, and Data usage, and choose last month's cycle. Pay attention to two things: the total and which three apps consume the most.
With that total, divide by 30 to find your daily consumption and apply this rule: in Greece, daily consumption is quite similar to at home, because Wi-Fi is just as available as in your daily life. In other destinations, you need to inflate it; here, there's no need to overdo it.
| What you spend per month at home | Equivalent per day | For 10 days in Greece |
|---|---|---|
| 2 GB | around 65 MB | 1-2 GB |
| 5 GB | around 165 MB | 3 GB |
| 10 GB | around 330 MB | 5 GB |
| 20 GB | around 660 MB | 8-10 GB |
| 40 GB or more | 1.3 GB or more | 15-20 GB |
An important nuance: if a good part of your monthly gigabytes are spent on your commute to work or at the gym, that consumption disappears on vacation and there's plenty of leeway. Conversely, if you rely heavily on Wi-Fi at home and barely use data, you'll use a bit more data on your trip because you'll be out and about more hours. Adjust wisely, but always start with your real number and not an intuition.
Nine ways to stretch your data in Greece
If you want to buy the small package and still have plenty left, this is what really works. Ordered by what saves the most.
| Tip | What it saves you |
|---|---|
| Photo backups only via Wi-Fi | 300-600 MB per day |
| Download series, podcasts, and music before the ferry | up to 1.5 GB per trip |
| Watch video at 480p instead of 1080p | from 1.5 GB/hour to 300 MB/hour |
| Disable autoplay on Instagram and TikTok | 30-50% of social media consumption |
| Offline maps of each island downloaded via Wi-Fi | almost all GPS consumption |
| Offline Greek package in the translator | 1-2 MB per query |
| Data saver mode activated (Android and iOS) | 10-20% of the total |
| App updates only via Wi-Fi | 100-500 MB per week |
| Upload your camera roll all at once, at night, from the hotel | all upload consumption |
The most cost-effective by far is the first one. Many people return from their trip convinced that "data just disappears" when what has actually happened is that their phone has been uploading photos to the cloud in the background for ten days. It can be fixed in thirty seconds from the settings.
I have the complete list, with screenshots of where each option is, in the guide to tricks to save data while traveling.
What happens if you run out (and why it's not a big deal)
The underlying question is usually this: what if I run out of data in Mykonos on a Sunday afternoon? Short answer: you top up from your phone in two minutes, using the Wi-Fi of any tavern, and you continue.
That's why my advice is always the same: underestimate and top up if necessary. Buying too much is throwing away money you won't get back; buying too little can be fixed. An expired data package cannot be returned, but a small package can be extended whenever you want.
There are also two very strong safety nets in Greece. The first is the omnipresent Wi-Fi we mentioned: you won't be without communication for a single day. The second is that, if you travel with other people, you can always share a connection from another phone while you figure things out.
And a warning about giant packages: 20 or 50 GB for a week in the Cyclades is, for 90% of travelers, money thrown away. I prefer you to buy 3 GB, have some left over, and come back next year, rather than selling you 20 GB and making you feel ripped off when you see your final consumption.
If you decide to buy data and want details on coverage, Greek operators, and activation, I have it all in the eSIM guide for Greece, which is the destination with the most favorable gigabyte-to-price ratio in the entire Mediterranean.
Frequently asked questions
Do I need to buy data if I travel to Greece with a Spanish plan?
No, in most cases, you don't. Greece is part of the EU, and your Spanish plan works there with your usual gigabytes. It only makes sense to buy data if your European allowance is very small, if your plan doesn't include data outside of Spain, or if you are traveling from outside the European Union.
How many GB do I need for a week in Greece?
2-3 GB is more than enough for a seven-day trip if you sleep in places with Wi-Fi and use your phone for maps, messaging, and a bit of social media. If you're going to upload photos and videos daily without waiting for hotel Wi-Fi, increase it to 4-5 GB. Below that, only if you barely use your phone.
Is there coverage on the ferry between islands?
Sometimes yes, sometimes no. When leaving port and approaching your destination, you usually have a signal; in the middle of the crossing, on long routes like Piraeus to Santorini, it gets lost for long stretches. Download anything you want to watch before boarding. Large ships usually have onboard Wi-Fi, but it's slow.
Can I trust the Wi-Fi in hotels and taverns?
Yes, it's among the best in the Mediterranean, with one caveat. Almost all accommodations and many taverns offer free Wi-Fi. But in August, on small islands, and with a full house, the network gets saturated: it's enough for messaging and little else. Save large downloads for early morning or late at night.
How much data do Google Maps and the translator use?
Very little: 3-5 MB per hour of navigation and 1-2 MB per camera translation. They are not the problem for your consumption. Even so, download the offline map of each island and the Greek language pack: in addition to reducing the cost to zero, they work on inland roads where coverage fails.
What happens if I run out of data halfway through my trip?
You top up in a couple of minutes and continue. With the Wi-Fi of any cafe, you can extend the package from your phone without formalities or paperwork. That's why I always recommend underestimating and topping up, rather than buying too much out of fear and not spending it all.
Is a data package worth it if I'm only in Athens?
If you're from the EU, no; if you're from outside, yes, and 3 GB for five days is more than enough. Athens has excellent coverage and Wi-Fi in almost all cafes. If this is your first time with this technology, here I explain what an eSIM is and how to activate it.
Conclusion
To summarize directly. If you are Spanish or from any EU country, Greece is included in your plan and you don't need to buy anything: check how much European allowance you have, and if it's more than 3 or 4 GB, forget this article and enjoy your trip.
If that's not your case, the numbers are these: 3 GB for ten days if you rely on hotel Wi-Fi and use your phone for maps, WhatsApp, and a bit of social media. 5-6 GB if you're island hopping, uploading photos and stories daily. 10 GB for a family sharing a connection. And 20 GB or more only if you're going to work from there with video calls.
Before you leave, do the two things that will save you the most: check your real data usage from last month in your phone settings and set photo backups to "Wi-Fi only." With that, most people underestimate their initial estimate, and on the good side.
And if you need to buy data, choose the small package and extend if necessary: you can view data plans for Greece and activate it in five minutes before boarding.
