Roughly one travel eSIM in four cannot be topped up: of 872 plans on sale in our catalogue on 21 September 2026, 650 support top-up (74.5%) and 222 do not (25.5%). When a plan that cannot be recharged runs out, you buy a new eSIM rather than adding data to the one you have.
This is the detail that turns a small problem into an annoying one. Running low on data in a foreign city is manageable if you can add 5 GB in ninety seconds. It is a different afternoon if you first have to find out that you cannot, then install a second profile on a phone that may already be holding as many as it allows.
- Top-up supported: 650 of 872 plans (74.5%).
- Top-up not supported: 222 of 872 plans (25.5%).
- Where it is stated: on every plan page, before checkout.
- If it is not supported: you buy another plan; the old profile stays on the phone until you delete it.
- Practical fix: size the plan with margin, or pick a top-up plan for open-ended trips.
What the audit found
| Finding | Plans | Share of 872 |
|---|---|---|
| Top-up supported | 650 | 74.5% |
| Top-up not supported | 222 | 25.5% |
| Plans stating the answer either way | 872 | 100% |
Every plan states its answer, which is the useful part: this is checkable before you pay rather than discoverable afterwards. The split is driven by the supplier behind each plan rather than by destination, so two plans for the same country can differ.
What top-up actually means
Topping up adds data, and usually days, to a profile that is already installed. Nothing is reinstalled, the eSIM keeps its place in your settings, and the line comes back to life once the purchase goes through. It is the same idea as a prepaid recharge.
When a plan does not support it, the alternative is a fresh plan: another purchase, another profile to install, and a choice about what to do with the old one. That matters more than it sounds on phones with limits on how many eSIMs they store — and on iPhones bought in China mainland, Apple says the limit is two profiles rather than the eight or more elsewhere.
| Top-up supported | Top-up not supported | |
|---|---|---|
| When data runs out | Add data to the same profile | Buy and install a new plan |
| Reinstall needed | No | Yes, a new profile |
| Time to get back online | Minutes, if you have a connection | Longer: purchase, then install |
| Needs an internet connection | Yes, for the purchase | Yes, for purchase and install |
| Profile slots used | One | One more each time |
Notice the row that traps people: both routes need an internet connection. A phone with no data cannot buy data. In practice that means hotel or café Wi-Fi, or a travelling companion’s hotspot, which is one more argument for not leaving it until the last gigabyte.
When top-up support is worth prioritising
- Open-ended trips. If you do not know whether you are staying one week or three, a top-up plan avoids a second install.
- Remote work. Usage is unpredictable and the cost of being offline is high.
- Phones that hold few profiles. If your phone stores only a couple of eSIMs, or it was bought in China mainland, each extra plan costs you a slot.
- Long stays where you started small. Buying 3 GB to test a destination, then extending, is cheaper than guessing high.
When it matters less: short fixed trips where you have sized the plan properly, and destinations where our catalogue is cheap enough that a second small plan costs a few dollars. Our price index shows the per-GB range across 71 countries.
Running out: what happens and what to do
When a plan is exhausted, data simply stops. Nothing bills you extra, because the plan is prepaid; the line stays in your settings but carries no traffic. Our guide to what happens when an eSIM runs out of data covers the details, including why your home line is a useful backstop.
- Check before the last gigabyte, not after. Most plans report usage in the app or account area.
- Get to Wi-Fi before buying, whether topping up or starting fresh.
- Keep the old profile until the new one is working, then decide whether to delete it.
- Do not delete a profile mid-trip casually: many eSIM QR codes install only once.
Buying with this in mind? The top-up line is on every plan page. Browse 190+ destinations, or check a specific one: Japan, Europe, the US, Turkey or China.
Method, and what this audit does not prove
We read the top-up field on every product published in our own catalogue on 21 September 2026, excluding items hidden from the catalogue, and counted the values. The population is 872 plans from 14 suppliers covering single-country, regional and global plans. Stock changes daily, so the split will drift.
What it does not prove: this describes the plans we sell rather than the whole travel eSIM market, and it reports what each plan states rather than testing the top-up flow on each one. Prices for top-ups are set per plan and are not part of this count.
Citing this: you are welcome to quote or reproduce these figures with credit to Code eSIM and a link to this page. Suggested citation: Code eSIM, Travel eSIM Top-up Audit, 21 September 2026, 872 plans. Companion audits: hotspot support and calls and SMS.
Frequently asked questions
Can you top up a travel eSIM?
Often, but not always. In our audit of 872 plans on 21 September 2026, 650 plans (74.5%) supported top-up and 222 (25.5%) did not. The plan page states which applies, so check before buying if you expect to extend.
What happens if a travel eSIM cannot be topped up?
You buy a new plan and install it as a separate profile. Nothing bills you extra on the old one, because travel eSIMs are prepaid, but you use another eSIM slot and you need an internet connection to complete the purchase and install.
Do I need Wi-Fi to top up an eSIM?
You need some internet connection to make the purchase, and a phone with no data cannot buy data. Use hotel or café Wi-Fi, or a companion’s hotspot, and top up before you are completely out rather than after.
Does topping up extend the validity as well as the data?
It depends on the plan: some top-ups add days along with data, others add data within the existing window. The plan page sets out what a top-up includes, so read it before relying on an extension for a longer stay.
Is it cheaper to top up or buy a new eSIM?
It varies by plan and destination, and our audit counted availability rather than price. For short extensions a top-up usually avoids paying a second activation; for a much longer stay a larger new plan can work out better per GB.
How many eSIM profiles can my phone hold?
Most current phones store several and keep two active. Apple says iPhones store eight or more, except those bought in China mainland, which store two. Plans that cannot be topped up consume a slot each time you buy again.
Should I delete an empty eSIM profile?
Not until the replacement is working, and not casually: many eSIM QR codes install only once, so a deleted profile can be gone for good. Keep the installation email, and delete old profiles when you are home rather than mid-trip.
How do I check my remaining data?
Most plans report usage in the seller’s app or account area, and phones also show a rough counter per line in settings. Check at the halfway point of a trip so there is time to top up or buy again on Wi-Fi.
Bottom line
Three quarters of the travel eSIM plans we sell can be topped up and a quarter cannot, and both numbers are printed on the plan page before you pay. If your trip has a fixed length and you have sized the plan with margin, it hardly matters. If the trip is open-ended, you work while travelling, or your phone holds few profiles, treat top-up support as a feature worth choosing deliberately.
Audited 21 September 2026 across 872 plans on sale in the Code eSIM catalogue, excluding items hidden from the catalogue. Figures describe the plans we sell on that date, not the whole market, and stock changes daily. eSIM storage limits are quoted from Apple’s published guidance. Illustrations are our own.