Knowing how much data you have left on your eSIM is the difference between arriving at the end of your trip worry-free or being stranded looking for Wi-Fi at an airport. The good news is that checking your usage takes ten seconds: it's done from your phone's settings or from your provider's app, with no physical cards or calls to customer service. In this guide, I'll show you where to look on iPhone and Android, how much each app consumes, and what to do when you see your balance running out.
Where to see your remaining data
To see how much data you have left on your eSIM, you have two options: your provider's app, which shows the exact plan balance (e.g., 3.2 GB out of 5 GB), and your phone's system counter, which adds up usage since the last time you reset it. The app is the reliable source for the actual balance; the phone's counter helps monitor daily spending habits.
The distinction matters because the phone's counter doesn't know how many gigabytes you purchased: it only counts what has passed through that line. If you activated your travel eSIM the same day you started traveling and reset the counter to zero, both numbers will almost perfectly match. If you installed it days before to test, the system counter will be ahead and scare you unnecessarily. That's why it's advisable to reset the counter on the first real day of use.
Check usage on iPhone
On an iPhone, the path is Settings > Mobile Data. Scroll down to your eSIM line (it appears with the name you gave it, like "Travel" or "Data") and you'll see the Mobile Data Usage section with the consumed amount. Below that, usage per application is displayed, ordered from highest to lowest.
The key detail: iOS does not reset this counter automatically. It shows the accumulated usage since the last manual reset, so the first number you see might include months of history. Before a trip, go to that same screen, scroll all the way down, and tap Reset Statistics. From then on, the number will only reflect what you use away from home. This is the action that prevents the most headaches, because without it, your iPhone will tell you that you've used 40 GB when in reality it's 2 GB.
Tip: reset the counter to zero on the day you land. This way, the "current period" figure is exactly your travel consumption, and you can calculate how much you have left by subtracting it from your total plan.
Check usage on Android
On Android, the path varies slightly depending on the brand, but the general way is Settings > Connections (or Network & Internet) > Data usage. On Samsung Galaxy, it's usually in Connections > Data usage > Mobile data usage, and there you choose the specific SIM or eSIM. Xiaomi hides it in SIM cards & mobile networks > Data usage.
The great advantage of Android is that it allows you to set a cycle and a warning or limit. You can tell it "warn me when I reach 4 GB" or even "cut off data at 5 GB," and the phone will stop you before you go over. If you're traveling with an eSIM of, say, 10 GB for two weeks, set the warning at 8 GB and you'll have room to react. For a general overview of typical daily usage, the travel data consumption guide is useful, as it translates gigabytes into actual days of use.
From the provider's app
The mobile counter is indicative; your provider holds the real balance. In the PuraSim app, you enter your eSIM and see a bar with the remaining gigabytes, validity days, and expiration date. That number takes precedence over the system's, because it also discounts the small background usage that the phone sometimes doesn't register properly.
Checking your balance in the app doesn't use travel data if you do it over Wi-Fi, and even with mobile data, it only takes a few kilobytes. Check it every two or three days to avoid surprises. And if you see that usage is higher than expected, many plans allow you to top up from the same screen in a minute, without changing eSIMs or reinstalling anything. Before topping up blindly, take a look at the tips for saving data abroad.
How much each app consumes
To calculate how much you have left, you need to know how much each app uses. These are approximate values per hour of use with mobile data, useful for budgeting while traveling:
| Activity | Approx. consumption per hour | Impact |
|---|---|---|
| WhatsApp (chat and voice) | 10-30 MB | Very low |
| Google Maps navigating | 5-10 MB | Low |
| Spotify (normal quality) | 50-70 MB | Medium |
| Instagram / TikTok | 500 MB-1 GB | High |
| Netflix (medium quality) | 0.7-1 GB | Very high |
The message is clear: messaging and maps barely move the needle, but streaming video and social media with reels will eat up your plan in an afternoon. A traveler who uses WhatsApp, checks maps, and uploads a few photos uses less than 300 MB a day; someone who watches series in the hotel can go through 3 GB per night. If you want to fine-tune your calculation before buying, see how much data you need for travel.
What to do when it runs out
If the balance reaches zero, the data connection is cut off, but the eSIM remains installed. You have three quick solutions. The first is to top up the same plan from the app if your provider allows it: it takes a minute, and you continue with the same settings. The second is to buy a new plan and activate it on top of the existing one. The third is to rely on hotel and cafe Wi-Fi for essentials while you decide.
What you should not do is reactivate roaming on your Spanish card all at once: that's when you'll get bills for €10 to €20 a day. If you're debating between topping up or going back to your home operator, the comparison of eSIM vs. roaming makes it clear why eSIM almost always pays off. And to completely disconnect roaming from your main SIM, you have the step-by-step guide on how to avoid roaming.
Tips to make your data last longer
With four adjustments, you can stretch your plan without giving up anything important. The most cost-effective is to download offline maps from Google Maps before you leave: you navigate without data. Secondly, lower the video quality on Netflix and YouTube to "data saver" and disable autoplay on Instagram and TikTok, which is where most of your plan escapes.
- Updates only over Wi-Fi: prevent apps from updating with mobile data.
- Photos and backups: upload them only when Wi-Fi is available.
- System data saver mode activated: limits background consumption.
- Streamed content downloaded at home: download series and playlists with Wi-Fi to watch them offline.
With these habits, a 5 GB plan will comfortably last a week of normal use for two people if shared with a hotspot. The key is to monitor the counter for the first few days to adjust your pace before it's too late.
Frequently asked questions
How do I see how much data I have left on my eSIM?
In your provider's app, you'll see the exact plan balance (remaining gigabytes and validity days). On your phone, go to Settings > Mobile Data (iPhone) or Settings > Data usage (Android) and select your eSIM line. The app is the reliable source; the system counter is indicative.
Why does my iPhone say I've used more data than I purchased?
Because iOS doesn't reset the counter automatically: it shows the accumulated usage since the last manual reset, which can include months. Go to Settings > Mobile Data, scroll all the way down, and tap Reset Statistics when you start your trip. This way, the figure will only reflect your actual consumption.
Does checking my balance use data from my plan?
Practically nothing. If you do it over Wi-Fi, it doesn't use eSIM data, and with mobile data, it only takes a few kilobytes. You can check it several times a day without worrying about consumption.
What do I do if I run out of data halfway through my trip?
The quickest way is to top up the same plan from the app in a minute, or buy and activate a new plan on top of it. While you decide, rely on hotel and cafe Wi-Fi. Avoid reactivating roaming on your Spanish card, which is much more expensive.
Which application uses the most data?
Streaming video (Netflix, YouTube) and social media with autoplay (Instagram, TikTok), which can exceed 1 GB per hour. WhatsApp, Google Maps, and Spotify consume very little in comparison. Lowering video quality is the adjustment that saves the most.
Conclusion
Seeing how much data you have left is quick: your provider's app gives you the real balance, and your phone lets you monitor your daily usage, as long as you reset the counter when you start your trip. Monitor the apps that consume the most, download maps and videos over Wi-Fi, and top up in time if necessary. With a well-managed travel eSIM, you won't run out of internet at the worst moment again.
