In short: to see how much data you have left on your eSIM, open your provider's app, which shows the exact balance in gigabytes and the expiration date, or check the system counter in Settings (iPhone) or Data Usage (Android). Reset the counter on the day you land for an accurate reading.
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 consumption takes ten seconds: you do it from your phone's settings or from your provider's app, without physical cards or calls to customer service. In this guide, I'll show you where to look on iPhone and Android, how much each application consumes, and what to do when you see your balance running low.
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 (for example, 3.2 GB out of 5 GB), and your phone's system counter, which tallies consumption since you last reset it. The app is the reliable source for your actual balance; the phone's counter helps you monitor your daily spending rate.
The distinction matters because your 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 on the same day you started traveling and reset the counter, both numbers will match almost perfectly. If you installed it days earlier to test, the system counter will be ahead and scare you unnecessarily. That's why it's a good idea to reset the counter on the first actual day of use.
Check usage on iPhone
On an iPhone, the path is Settings > Cellular. Scroll down to your eSIM line (it appears with the name you gave it, like "Travel" or "Data") and you'll see the Current Period Cellular Data section with the amount consumed. Below it, you'll find the usage per application, ordered from most to least.
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 the 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 step that avoids the most headaches, because without it, your iPhone will tell you that you've used 40 GB when in reality it's only 2.
Tip: reset the counter to zero on the day you land. This way, the "current period" figure will be 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 route is Settings > Connections (or Network & internet) > Data usage. On Samsung Galaxy, it's usually under Connections > Data usage > Mobile data usage, where you then select the specific SIM or eSIM. Xiaomi hides it under SIM cards & mobile networks > Data usage.
The big 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 your phone will stop you automatically before you overspend. If you're traveling with a, say, 10 GB eSIM for two weeks, set the warning at 8 GB and you'll have room to react. To extend that margin without giving up anything essential, take a look at our guide on tips for saving data with your eSIM abroad.
From your provider's app
Your phone's counter is an estimate; your provider has the actual balance. In the PuraSim app, you go into 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 accounts for the small background consumption that the phone sometimes doesn't record properly.
Checking your balance in the app does not consume travel data if you do it over Wi-Fi, and even with mobile data, it uses only a few kilobytes. Check it every two or three days to avoid surprises. And if you see that the usage rate is higher than expected, many plans allow you to top up from the same screen in a minute, without changing eSIMs or reinstalling anything. If your route continues through several countries on the continent, before topping up, see if the Europe eSIM is a better value for you, as it covers dozens of destinations with a single plan instead of buying credit country by country.
How much each application consumes
To calculate how much you have left, you need to know how much each app uses. These are estimated 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 takeaway is clear: messaging and maps barely move the needle, but streaming video and social media with reels can devour your plan in an afternoon. A traveler who uses WhatsApp, checks maps, and uploads a few photos uses less than 300 MB per day; someone who watches series at the hotel can go through several gigabytes per night. If you're still not sure which plan fits your travel style, check out our guide on how to buy the eSIM you need before installing anything.
With Netflix, the margin is the widest in the table because it completely depends on the quality activated in the app: in "Automatic," it tends towards the higher end, and a couple of episodes in a row will make a difference. Go into the Netflix app settings, lower the video quality to "Low data usage," and consumption drops to a fraction of that, enough to watch a series in the background without running out of data by mid-afternoon. Change this option once before leaving home, and it will be saved for the entire trip.
What to do when you run out
If the balance reaches zero, the data connection is cut, but the eSIM remains installed. You have three quick options. First, top up the same plan from the app if your provider allows it: it takes a minute, and you keep the same settings. Second, buy a new plan and activate it on top of the existing one. Third, use hotel and cafe Wi-Fi for essentials while you decide.
What you should not do is reactivate roaming on your home country's SIM card all at once: that's when you get bills of €10 to €20 per day. If you're debating between topping up or returning to your home operator, the comparison of eSIM vs. roaming makes it clear why eSIM is almost always more cost-effective. And if you're still not entirely sure what that charge appearing on your bill is when your phone jumps to the local network, we explain it in what data roaming is.
Tips to make your data last longer
With four adjustments, you can extend your plan without sacrificing anything important. The most cost-effective is to download offline maps from Google Maps before you leave: you can navigate without data. Secondly, lower the video quality on Netflix and YouTube to "data saver" and disable auto-play on Instagram and TikTok, which is where most of your plan escapes.
- Updates only over Wi-Fi: prevent apps from updating using mobile data.
- Photos and backups: upload them only when Wi-Fi is available.
- System data saver mode activated: limits background consumption.
- Downloaded streaming at home: download series and playlists over Wi-Fi to watch them offline.
With these habits, a 5 GB plan will easily last a week of normal use for two people sharing a mobile hotspot. If you're going to share your hotspot on hotel or cafe networks, it's also advisable to protect that connection; we tell you how in VPN and privacy while traveling with eSIM. The key is to monitor the counter for the first few days to adjust your pace before it's too late.
What almost no one tells you about the data counter
The percentage bar in the app doesn't always tell the whole story. Many times, the number you see on the screen already includes consumption that you haven't intentionally generated: automatic background app updates, photo backups that start on their own as soon as they detect a signal, or push notifications with images that download even if you don't open the app. If the counter rises faster than you "feel" you're using your phone, first check background processes before assuming something is wrong with the eSIM.
Another detail that surprises those traveling with an eSIM for the first time: the faster the network, the faster the plan is consumed, not slower. In South Korea, for example, 5G is so efficient that a video app loads all the quality it can in seconds without you having to do anything; the same minute of video consumes more megabytes than on a slower 4G network. In destinations with very fast connections, it's advisable to set a lower-than-usual warning limit, precisely because the reaction time is reduced.
The opposite happens in areas with weak coverage: the phone constantly searches for a signal, retrying connection again and again, and this back and forth also consumes data even if you're not browsing. On long road trips, such as those in Australia or New Zealand, there are sections without coverage for hours; in these cases, it's not that data is "being used up," but rather that it's advisable to have the map downloaded beforehand, because the phone constantly searching for a network does impact the battery and, upon regaining signal, usually syncs everything pending at once.
And a clarification for those looking to check their balance without finding the exact menu: the system Settings method works regardless of the eSIM you have installed, because it measures the traffic on that line, not the provider. The only thing that changes from one app to another is the design of the screen where you see the plan balance; the mobile counter works exactly the same. If the number doesn't match up and you can't explain it, PuraSim support is available 24/7 in all languages via email and WhatsApp, and with over 200 destinations in the catalog, it's normal to have coverage even if you change countries mid-route.
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 > Cellular (iPhone) or Settings > Data usage (Android) and select your eSIM line. The app is the reliable source; the system counter is an estimate.
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 > Cellular, scroll all the way down, and tap Reset Statistics when you start your trip. This way, the figure will reflect only your actual consumption.
Does checking my balance use up my data plan?
Practically none. If you do it over Wi-Fi, it doesn't use your eSIM data, and with mobile data, it uses only 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 mid-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 the existing one. While you decide, use hotel and cafe Wi-Fi. Avoid reactivating roaming on your home country's SIM card, as it 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.
How much data does watching Netflix with an eSIM consume?
It primarily depends on the quality setting you have activated in the app: with "Automatic," consumption goes to the higher end, while with "Low data usage," it drops to a fraction of that. Change this setting within Netflix before traveling, and it will remain in effect throughout your journey, regardless of the eSIM you use.
Does the method for checking data work the same for any eSIM, not just PuraSim's?
Yes. The steps through system Settings (iPhone or Android) measure the traffic passing through that line; they do not depend on the provider who sold you the eSIM. What changes from one app to another is only the design of the screen where you check the plan balance; the mobile counter works exactly the same.
Conclusion
Checking how much data you have left is quick: your provider's app gives you the actual balance, and your phone lets you monitor daily usage, as long as you reset the counter when you start your trip. Monitor data-hungry apps, download maps and videos over Wi-Fi, and top up in time if needed. With a well-managed travel eSIM, you won't run out of internet at the worst possible moment again.
