4S eSIM Review (2026): Is this new provider legit?

I’ll be honest, when a new eSIM provider shows up promising very competitive prices and relatively few reviews, my first instinct is scepticism. So I bought a plan for Portugal, another for Denmark, and put 4S eSIM through the same testing I use for every provider I review: real speed tests, a genuine install, and a proper look at what happens when something doesn’t work as expected.

4S eSIM is still young. It doesn’t have the review history of the bigger names in this space, and at the time of writing it sits at 4.2 out of 5 on Trustpilot from just 19 reviews. That’s a small sample, so I wouldn’t treat it as solid proof of long-term reliability either way. What I can tell you is what I found from actually using it.

The short version: the connectivity itself was excellent, and prices were some of the lowest I’ve tested. The website still has some room for improvement, and a few things I only understood after chatting with support could be explained more clearly upfront. Look past that, and there’s a genuinely good service underneath it.

What is 4S eSIM?

4S eSIM is a relatively new player in the travel eSIM space, offering data plans for over 200 countries and regions. It’s a data-only service, so there’s no traditional calling or texting built in. Instead, you’ll rely on apps like WhatsApp, iMessage, Telegram or FaceTime for staying in touch, which most travellers are already using anyway.

You buy a plan through their website or Android app, install it via QR code, and you’re connected once you land. No physical SIM swap, no visiting a local shop, no waiting in an airport queue.

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How much does 4S eSIM cost?

4S eSIM plans start from €1.03 for 1GB/1 day, up to €21.29 for 50GB/30 days in Denmark. 4S eSIM offers three types of plans for most destinations: country-specific, regional, and global. For Denmark, for example, you can buy a Denmark-only plan, a European regional bundle covering Denmark plus 35 other countries, or a wider global bundle spanning Denmark plus 110 more.

Here’s what Denmark-only pricing looks like as of August 2026:

Regional bundle pricing

One of the genuinely good surprises here is the regional pricing. If your trip covers more than one European country, it’s well worth checking the regional bundle before defaulting to a single-country plan. In several cases, the difference is tiny:

For a few cents more, you get coverage across dozens of countries instead of one. If there’s any chance you’ll cross a border, it’s worth checking the bundle price.

The wider global bundles (Denmark plus 110+ countries) cost noticeably more, which makes sense given the broader coverage, so those are better suited to genuinely multi-continent trips rather than a single European getaway.

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Is 4S eSIM cheap compared to other providers?

Compared to other eSIM providers I’ve tested, 4S eSIM consistently comes out as one of the cheapest options, especially for European destinations. For a 10 GB, 7-day plan, some competitors charge two to three times as much for the same amount of data.

The gap is smaller for very small data packages, where a few competitors are just as cheap or occasionally cheaper. But once you move into medium and larger allowances, which is where most digital nomads and longer-stay travellers end up, 4S eSIM’s pricing is hard to beat.

Where 4S eSIM stands out even more is the sheer number of plan combinations available. Most providers offer a handful of set packages. 4S eSIM lets you choose from dozens of data and validity combinations for a single destination, so you can fine-tune a plan closer to what your trip actually needs, rather than rounding up to whatever’s on offer.

That flexibility does come at a cost, though: it makes the plan selection page busier and less intuitive than competitors with a simpler menu. More on that in the next section.

4S eSIM setup and installation

Installation takes about 3 minutes via QR code. The plan selection page is where 4S eSIM’s biggest weakness shows up. Search for a destination, and you’ll see country-specific plans, regional bundles, and global bundles all mixed together in the same results, along with both standard and ∞ (throttled-after-cap) versions of similar data amounts. It took a bit of scrolling and comparing to work out which plan actually made sense for my trip.

Once I’d picked a plan, checkout itself was straightforward, with standard payment options. One small detail: purchasing required being logged in first, and logging in partway through interrupted the flow, sending me back to search for and reselect the plan. Not a dealbreaker, just an extra step worth expecting.

After checkout, I was redirected to my order history, where the purchased eSIM appeared. The QR code and installation instructions arrived by email shortly after, which made the next step easy to find.

Installation itself was excellent. Scanning the QR code on my iPhone 15 Pro kicked off an automatic setup process, and the only manual step was switching on data roaming. From scanning the code to being connected, it took around 3 minutes. I repeated the process for a Denmark eSIM and a Portugal eSIM and had the same smooth experience both times.

One thing worth flagging for iPhone users specifically: there’s no native 4S eSIM app for iOS. 4S explains how to add the website to your home screen as a shortcut, which helps a bit, but it’s not the same as a proper app. Everything, from checking your plan to topping up, happens through the website. An Android app does appear to be available, though I didn’t test it myself.

How fast is 4S eSIM?

Prices are one thing, but I wanted to see how 4S eSIM actually performs in real conditions, so I ran speed tests in two different countries.

4S eSIM Portugal speed test (Ericeira and outer Lisbon area)

Connected to Vodafone P on 5G, I ran two tests:

That’s an average download speed of around 244 Mbps. Plenty for streaming, video calls, browsing, and even large downloads, with upload speeds that were lower but still perfectly usable for everyday work.

4S eSIM Denmark speed test (Copenhagen)

Speeds here were even stronger:

• Phone: 560 Mbps download, 36.5 Mbps upload
• Laptop hotspot: 97.68 Mbps download, 30.46 Mbps upload

Both results comfortably cover video calls, cloud-based work, streaming, and general remote work needs. Across two different countries, 4S eSIM delivered consistently strong real-world speeds, which matters more than any number on a spec sheet.

Does 4S eSIM support hotspot and tethering?

Hotspot is supported on 4S eSIM plans, and there’s no separate cap for it. Whatever data you’re sharing comes out of the same high-speed allowance as your main plan, rather than a smaller sharing-specific limit some competitors apply.

In Portugal, my first hotspot speed test came in around 100 Mbps download, a strong result. After that, though, the connection became unreliable for a while: some websites wouldn’t load, and a few speed test attempts failed outright. I checked with 4S support, who confirmed I’d only used around 1.76 GB of my 10 GB allowance, so throttling wasn’t the cause. After running through some standard troubleshooting steps with them (toggling Airplane Mode, reconnecting the laptop), the hotspot worked properly again and didn’t cause any further problems. My final test after that reached 175 Mbps download and 10.32 Mbps upload.

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In Denmark, hotspot performance was strong from the start: 97.68 Mbps download and 30.46 Mbps upload on my laptop, comfortably enough for video calls, cloud-based work, and everyday browsing.

That combination of speed and no separate data cap makes 4S eSIM’s hotspot genuinely useful, whether you need it for a remote workday, sharing a connection with a travel companion, or just getting your laptop online for an evening in a place without reliable Wi-Fi.

4S eSIM data tracking

Since there’s no iOS app, keeping an eye on your data happens through the 4S eSIM website. Once logged in, you can see your current usage, which appeared to update in real time during my testing, along with your purchased eSIM details and the activation QR code, which stays accessible in your account if you need it again.

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There’s also a top-up option that uses the same quick checkout flow as the original purchase, so if you’re running low mid-trip, adding more data doesn’t mean starting from scratch.

4S eSIM customer support experience

4S eSIM handles support through Zendesk live chat. When I first opened it, it didn’t connect me straight to a person. Instead, it asked for my name and email and said someone would get back to me, without giving a clear timeframe upfront. Once the conversation was underway, though, replies came in reliably every 5 to 10 minutes.

That’s not instant, which matters a bit more with eSIMs than with most other purchases. If you land somewhere and can’t get connected, you might be without Wi-Fi and relying on that same chat to sort it out. Worth knowing that going in, so you’re not caught off guard.

Once I was actually talking to someone, the quality of support was genuinely good. They explained how the hotspot allowance worked, checked my actual data usage when the hotspot issue came up, walked me through the throttled-speed rules on unlimited plans, and gave clear, specific troubleshooting steps rather than generic advice. They also confirmed details like activation timing, which I couldn’t easily find written down anywhere on the site itself.

That’s the pattern worth flagging here: the support team clearly knows the product well, but a fair amount of what they explained should really be easier to find on the website upfront, rather than something you only learn by asking.

Overall: is 4S eSIM legit and worth it?

Based on my testing, yes, with a clear caveat about who it’s best suited for.

The core service is excellent. Speeds in both Portugal and Denmark were consistently strong, hotspot performance held up well once a minor early hiccup was resolved, installation was fast and genuinely painless, and pricing is some of the most competitive I’ve seen, especially for European destinations. The regional bundles are also worth a proper look; paying a few cents more for coverage across dozens of countries instead of one is easy value to leave on the table if you don’t check.

Where 4S eSIM falls short is the experience around the service rather than the service itself. The plan selection page mixes together a lot of similar-looking options, there’s no native iOS app, and a few useful details, like exact hotspot conditions or throttled speeds, are easier to get from customer support than from the website directly.

As for the trust question I opened with: 4S eSIM is still a newer provider without a long review history, but everything I found through actual use points to a legitimate, well-functioning service. The early Trustpilot feedback (4.2/5 from 19 reviews) lines up with that, even if the sample is still small.

If you don’t mind managing things through a website rather than an app, and you’re comfortable doing a bit of comparing before you buy, 4S eSIM is genuinely worth considering, whether you’re travelling for work, a longer trip, or just want reliable, affordable data without the fuss of a local SIM.

Ready to try it? Nomadwise readers get 15% off any order with the code Nomadwise15.

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