Ran Out of Data Abroad? Top Up the eSIM You Already Have

It always happens at the worst moment. You are halfway through the trip, the map is loading slowly, and a notification says your data is almost gone. The good news: in most cases you do not need a new eSIM, a new QR code or a trip back to the settings menu. You can add data to the eSIM you already have, and the line keeps working as if nothing happened.

This guide explains what a top-up is, how to tell whether your plan can take one, how to do it, how to know how much data you really have left, and when a top-up is not the right answer.

What a top-up actually does

A top-up adds data to the same eSIM that is already installed on your phone. There is no new QR code to scan, nothing to delete and nothing to reinstall. Your settings stay exactly as they are, the line stays the same, and the connection carries on. From your phone's point of view, nothing changed except that there is more data.

That is the whole point. Installing a new eSIM in the middle of a trip is not hard, but it is one more thing to do on a phone that is running out of data, often on hotel Wi-Fi, often in a hurry. A top-up skips all of that.

Can my plan be topped up?

Most can. Right now about 76% of our live plans can be topped up. You can see it before you buy: plans that can be topped up carry a Topup badge on the plan card.

If you are planning a long trip, or you are not sure how much data you will use, that badge is worth looking for. It means you can start with a sensible size and add more later, instead of paying up front for data you might never use.

How to top up, step by step

• Log in to your AirPlans account.
• Open My eSIMs and select the eSIM you are using on this trip.
• Choose Top-up and pick a data package.
• Pay. The data is added to the same eSIM within moments.

That is it. No reinstalling, no new QR code, no settings to touch. Our guide to topping up and managing your eSIM walks through the same screens with a little more detail.

How much data do I really have left?

This is where many travellers get caught out, so it is worth a minute.

Your phone has its own mobile data counter in the settings, and it is tempting to trust it. Do not rely on it. It counts from whenever it was last reset, not from the day your plan started, so it may include data from a previous trip or from another line. The number it shows and the data left on your plan rarely match.

The number to trust is the one in My eSIMs. It shows how much data you have used and how much is left on that specific eSIM, along with the validity dates. On a longer trip, glance at it once every day or two. Catching an unusual jump early, such as a photo backup running over mobile data or an app updating itself, can save a lot of data.

When to top up, and why not to wait

Top up before you run out, not after. It sounds obvious, but there is a practical reason. Paying for a top-up and getting the confirmation is much easier while you still have a working connection. If you wait until the data hits zero, you will be looking for Wi-Fi in a station or a café to buy more.

A good rule: when what is left looks like about one more day of your normal use, top up. And if you know a heavy day is coming, such as a long drive with navigation, a day of video calls or sharing your connection with a laptop, top up the night before.

One more thing to keep in mind: unused data expires when the validity ends. A top-up is for data you expect to use on this trip, not something to stock up for the next one.

How much should I add?

You do not have to guess. You already have the best possible data on how you use your phone abroad: your own usage so far.

• Look at how much you have used in My eSIMs and divide it by the number of days you have been away. That is your daily average.
• Multiply that by the days you have left.
• Add a margin for the unexpected, especially if you have a travel day, a lot of photos to upload or a hotspot to run.

If your usage so far has been unusual, for example because you spent the first days on hotel Wi-Fi, our guide on how much data you need for travel gives realistic numbers for maps, messaging, social media and video.

When a new plan is the better deal

Here is something we would rather tell you up front. A top-up is convenient, but it is not always the cheaper option.

Sometimes the network charges more for a top-up than a brand new plan of the same size costs. When that happens, we do not offer the top-up for that eSIM at all, because a new plan is simply the better deal for you, and we would rather not sell you the more expensive path just because it is easier.

So if you open My eSIMs and there is no top-up available for your eSIM, or you are heading somewhere your current eSIM does not cover, the right answer is a new plan. You can find one on our destinations page. The cost of that choice is that you install a new eSIM. A few tips to make it painless:

• Install the new eSIM while you still have some data left or are on Wi-Fi, so the installation goes smoothly.
• Give the new line a clear name in your phone settings, so you can tell the old one and the new one apart.
• Switch mobile data to the new line and make sure data roaming is on for it.
• Keep the old eSIM until the new one is working. Do not delete an eSIM mid-trip as a way to fix something.

If the extra data does not seem to arrive

A top-up lands on the same eSIM, so the first thing to check is that the phone is actually using that line for data. Make sure the eSIM is selected for mobile data, that data roaming is switched on for it, and check the balance in My eSIMs. Restarting the phone or toggling airplane mode for a few seconds often helps it pick up the network again. If it still does not connect, our eSIM troubleshooting guide goes through the rest of the checklist.

The short version

Running low on data abroad is not a crisis. Check your real balance in My eSIMs rather than the phone's counter, top up a little before you run out, and size the top-up from your own usage so far. Most plans can be topped up, and the Topup badge tells you before you buy. When a top-up is not offered, it is because a new plan is the better deal, and that is the one to buy.