In short: to save data with an eSIM while traveling, activate your system's data-saving mode, download maps and playlists before leaving the hotel, and limit video streaming quality. With these adjustments, a plan designed for a few days can easily last you the entire week without running out of data or needing to buy an extra plan halfway through your trip.
Most people buy a data plan and forget about it until they get the "200 MB left" notification. The problem is almost never that the plan is too small: it's that your phone keeps consuming data in the background while you sleep, apps you won't open throughout your trip update, and social media loads video at the highest possible quality without asking you. Adjust these three things before getting on the plane and you'll notice the difference on the first day.
What really eats up your data
Before changing anything, it's good to know where the data goes. Not everything weighs the same, and there are surprises: what you notice most isn't always what you think.
- Video streaming (Netflix, YouTube, Prime Video): This is, by far, what consumes the most data. At high or automatic quality, it can easily exceed 1-3 GB per hour without you noticing; at low or medium quality, that consumption drops significantly.
- Social media with video (TikTok, Instagram Reels): Endless scrolling with autoplay is the silent enemy. You don't feel like you're "watching videos," but every reel that passes your screen has loaded several MBs.
- Video calls: These consume more than they seem to, especially in HD. A WhatsApp voice call uses little data; the same call with video uses significantly more.
- GPS navigation with real-time map loading: This is where most people get a shock because they don't associate it with "consuming data" – it seems like the phone is just guiding you.
- Music streaming: If you download it beforehand via Wi-Fi, the consumption is practically zero. If you stream it live all day, it adds up.
- Messaging (WhatsApp, Telegram) without photos or videos: This barely consumes any data. This is not where you need to save.
The practical lesson: if you're going to consume something passively and for an extended period (music, video, podcast), download it via Wi-Fi. If it's something occasional and in real-time (a map, a quick search), use data without fear – that's not where your plan will run out.
Operating system settings that truly make a difference
iOS and Android have had a data-saving mode for years that almost no one activates. It doesn't change how you use your phone; it just prevents apps from doing things in the background that you never asked for.
| Setting | On iPhone | On Android |
|---|---|---|
| Low Data Mode | Settings → Cellular → Cellular Data Options → Data Mode → Low Data Mode | Settings → Network & internet → Data Usage → Data Saver |
| Background App Refresh | Settings → General → Background App Refresh → Wi-Fi Only | Settings → Apps → each app → Mobile data & Wi-Fi → Background data OFF |
| Update apps from store | App Store → Settings → App Store → Automatic Downloads OFF for cellular data | Play Store → Settings → Network preferences → Auto-update apps over Wi-Fi only |
| Photo backup | Settings → Photos → Mobile Data OFF (use Wi-Fi only) | Google Photos → Settings → Backup → Use cellular data OFF |
| Push email | Settings → Mail → Accounts → Fetch New Data → Manually | Gmail → Settings → account → Sync → Manual |
The trick in this section is not to activate it on the first day and forget about it: it's to review it on the first night of your trip, because some apps (especially camera and cloud storage apps) reactivate synchronization on their own after a system update.
The apps that consume the most and how to tame them one by one
You don't need to uninstall anything or live without social media during your trip. With five minutes of adjustments per app, data consumption drops significantly without losing any functionality you actually use.
Netflix, Prime Video, and YouTube
Download the episodes or videos you know you'll watch on the plane, train, or in your room via Wi-Fi the night before. On Netflix, the download icon is next to each episode; on YouTube, it's the downward arrow button. If you're going to watch something live with data, manually lower the quality: on YouTube, tap the three dots → Quality → 480p is perfectly watchable on a mobile phone screen.
Spotify and Apple Music
Download playlists at home before you leave. If you forget, on Spotify you can force "Low streaming quality" from Settings → Audio Quality, which reduces the data usage without a noticeable difference on mobile headphones.
Instagram, TikTok, and X
Instagram has a "Data Saver" switch in Settings → Account → Data Saver, which reduces image quality and disables video preloading. TikTok doesn't have such a clear data saver, so the best trick here is simply to control your scrolling time – it's the app where it's easiest to lose track of how much you've been watching.
Google Maps and navigation apps
This is the one that really changes the trip. Download the map of the area before leaving the hotel: in Google Maps, search for the city, tap your profile picture → Offline maps → Download new map, and select the area. With the map downloaded, the app continues to function with GPS and calculate routes even if you have no signal bars.
Settings → Storage and data → Data usage → enable "Use less data for calls" and disable automatic download of photos and videos when using mobile data. This is the app that consumes the least data if photos aren't downloaded automatically.
Offline navigation: where most people go wrong
Most people download the map of an entire city and think they're covered. The real problem appears in very specific places: in the medina of Fez or the old town of Dubrovnik, the signal gets lost between narrow alleys and stone buildings even if you have plenty of coverage a hundred meters away. If you haven't downloaded the map, the app gets stuck "loading" just when you need it most, usually when you're already lost.
Another common mistake: people download an offline map but don't save addresses (the hotel, the airport for the return trip) as favorites before leaving. Without data, searching for "what was the hotel called" on an offline map is much slower than tapping a saved marker. Save the three or four key points for the day before leaving your room, not when you're already on the street with no coverage.
Maps.me and Organic Maps are completely offline alternatives, especially useful for hiking routes or rural areas where you won't have stable coverage even with data — in the Andean altiplano or mountainous regions of New Zealand, for example, this makes the difference between getting truly lost or not.
Myths and what almost no one tells you about data saving
There's a lot of noise around this topic, and not everything that circulates is true. Some things worth clarifying:
- "GPS consumes mobile data." No. GPS works via satellite and doesn't use a single MB. What consumes data is loading the map on the screen and calculating the route in real-time — that's why downloading the map beforehand eliminates almost all navigation data usage, not the GPS itself.
- "Closing apps from multitasking saves data." In practice, it barely makes a difference, and in some cases, it even causes the app to re-sync entirely when reopened, using more data. What truly reduces consumption is restricting background data from each app's settings, not manually closing them every five minutes.
- "Airplane mode with Wi-Fi on saves mobile data." That's true, but many people activate it and forget that they are still connected to the hotel or café Wi-Fi, so when they go outside unknowingly, the phone has neither data nor Wi-Fi and "nothing works." Make sure you reactivate mobile data before going outside.
- "A VPN reduces data consumption because it compresses traffic." Some VPNs with compression can help a little, but the main reason to use a VPN when traveling is security on public Wi-Fi, not saving data. Don't activate it expecting it to be your data-saving solution.
- "With unlimited data, you don't need to adjust anything." It depends on the operator. Many "unlimited" international roaming plans reduce speed after a usage threshold — after that, you can browse, but very slowly. Adjusting consumption also helps you avoid reduced speed during the last days of your trip.
- "The higher the video resolution, the better the experience." On a mobile screen, the difference between 480p and 1080p is almost imperceptible to the naked eye, especially when viewed from a distance or in motion. It's one of the settings that saves the most and is least noticeable.
How many GB you really need based on how you travel
This is the question everyone asks before buying a plan, and the answer changes a lot depending on the type of traveler you are. As a general guide, not an exact science:
| Usage Profile | What they do with their phone | Guidance for a short trip (5-7 days) |
|---|---|---|
| Minimum use | Offline maps, WhatsApp text, occasional quick searches | A small, basic plan is usually enough |
| Moderate use | Social media with photos, real-time map some days, messaging with photos | An intermediate plan provides ample margin without stress |
| Normal use | Social media with video, some streaming, real-time map almost daily | A generous plan is advisable, or thoroughly apply the settings in this guide |
| Intensive use | Remote work, video calls, unrestricted HD streaming | You need the largest plan available for your destination, and it's still advisable to apply the settings |
If you're torn between two plan sizes, the best rule of thumb is: apply the settings in this guide from day one and choose the intermediate plan, not the largest. It's much more common to have data left over than to run out, especially if you've deactivated automatic syncing before leaving home.
When you don't need to worry so much about saving
It's not all about restrictions. If you're going to a destination where you'll spend most of your time in a hotel, Airbnb, or places with decent Wi-Fi (a European city with good infrastructure, for example), there's no need to obsess over every MB: use Wi-Fi for heavy tasks and save your data for when you're out and about. And if your trip is a weekend getaway and a small plan is more than enough, it's not worth spending half an afternoon checking settings — activate them quickly and that's it; the goal is to enjoy the trip, not manage your phone.
What you're going to forget (and will ruin your first day)
Almost everyone does this the night before, with luggage already packed and in a hurry: they download the map, put on a couple of playlists, and that's it. Then, upon landing, it turns out the downloaded map only covered the city center and the hotel is in a neighborhood that was left out. Or the playlist only partially downloaded because the home Wi-Fi cut out. Check your downloads the next day, calmly, before leaving home — not at the airport with your boarding pass in hand. And if your eSIM activates as soon as you land, take advantage of the first few minutes with coverage to verify that the data-saving settings have actually been applied; sometimes a system update resets them without warning.
If you're also traveling with an eSIM, you save yourself the step of looking for a physical SIM card store as soon as you land — you activate it before leaving home and arrive with internet from the first minute, without roaming and without the surprise of the bill. At PuraSIM, we have plans for all of Europe and the United States, with over 200 destinations in our catalog and 24/7 email and WhatsApp support in all languages if anything goes wrong during installation.
If you're not sure about the difference between an eSIM and traditional roaming, we explain it in detail in our guide on eSIM vs. roaming, and if it's your first time installing one, the step-by-step is in how to install an eSIM. To understand exactly what data roaming is and why its price skyrockets outside the EU, check out what is data roaming.
And if you want more specific tips applied to daily travel (not just system settings, but on-the-ground behaviors), we have a complementary guide with 10 tricks to save data with your eSIM while traveling. If you're also concerned about privacy when connecting to public hotel or airport Wi-Fi networks, check out eSIM and VPN: how to use them together. And if you're deciding between buying a physical international SIM card or an eSIM, the comparison is in international SIM vs. eSIM.
Frequently asked questions about saving data with an eSIM
Does low data mode affect video call quality?
Yes, somewhat. For voice calls on WhatsApp or Telegram, it's barely noticeable. In video calls, the resolution drops a bit, but it's still perfectly usable for a quick call with family or for work.
How much data does it take to download an offline map of a city?
It largely depends on the size of the city and how much detail you include, but it usually ranges from a few hundred MB to just over 1 GB for a large capital. Always download it with Wi-Fi before you leave, never with mobile data.
Can automatic app updates consume a lot of data during my trip?
Yes, and it's one of the most common causes of data usage surprises. A single update can be several hundred MB, and if you have many unrestricted apps, they can add up quickly without you realizing it. Disable them before leaving home.
Does my phone's GPS consume data from my eSIM?
No. GPS works via satellite, completely independently of mobile data. What consumes data is the map loading and real-time route calculation, not the location itself.
Is it worth using a VPN to reduce data consumption?
That's not its primary function. Some VPNs with compression can help a bit, but the real reason to use a VPN while traveling is to protect your connection on public Wi-Fi networks, not to save data. If you want to delve deeper into this, we have a specific guide on eSIM and VPN linked above.
How many GB do I need for a week-long trip if I apply these settings?
It depends on your usage profile, but with the settings in this guide activated, most travelers with moderate use (maps, messaging, some social media) can manage with an intermediate plan. If you're going to stream in HD or make long video calls for work, you'll need a larger plan.
Why does my plan run out faster on the first day than the rest of the trip?
This usually happens because apps sync all at once when connecting to a new network: pending photo uploads, app updates, accumulated emails. It's normal for the first day to consume a bit more; if you've applied the settings in this guide before leaving, that peak will be significantly reduced.
