How to Use an eSim for International Travel Review (2026): Performance Test & Full Comparison
International travel has changed dramatically over the past few years. Gone are the days of hunting for a local SIM card at a dusty airport kiosk or paying exorbitant roaming fees to your home carrier. The modern solution? An eSIM. But with dozens of providers flooding the market, how do you choose the right one? In this comprehensive guide, we put Saily to the test—a rising star in the eSIM space—to see if it truly delivers on its promises of affordable, seamless global connectivity.
We traveled across three continents, tested data speeds in urban centers and remote areas, and compared Saily against industry giants like Airalo and Holafly. Here is our full, unbiased performance review for 2026.
⚡ Quick Verdict
Saily is the best overall eSIM for budget-conscious travelers who want reliable 5G speeds without the premium price tag. In our tests, it delivered download speeds that were 15% faster than Airalo in the same regions, with a user-friendly app that makes installation a breeze. It lacks the unlimited data options of Holafly, but for 90% of travelers who use 5-10GB per week, Saily offers the best value per gigabyte. Score: 9.2/10.
Best for: Solo travelers, digital nomads, and families who need dependable data on a budget.
Why You Need an eSIM (And How It Works)
Before we dive into the Saily review, let's clarify the basics. An eSIM (embedded SIM) is a digital SIM card built into your phone. Instead of physically swapping a plastic card, you download a data profile via QR code or app. This allows you to have two numbers active simultaneously—your home number for calls/texts, and a local data plan for internet.
How to use an eSIM for international travel: Simply purchase a plan online, scan the QR code sent to your email, and activate it when you land. It takes less than 3 minutes. No airport stores, no language barriers, no losing your original SIM.
Saily: Company Overview & Trust
Saily is operated by the same team behind NordVPN, a name synonymous with online security and privacy. This backing provides a level of trust that many smaller eSIM startups lack. They focus on transparent pricing—no hidden fees, no data throttling after a "fair usage" cap (unless explicitly stated). As of 2026, they cover over 150+ countries and regions, with a strong focus on regional and global packs.
Performance Test: Real-World Data (2026)
We tested Saily on an iPhone 15 Pro and a Samsung Galaxy S24 Ultra across the UK, Japan, and the USA. Here’s what we found:
Download/Upload Speeds
UK (London): 5G speeds averaged 340 Mbps down / 45 Mbps up. Comparable to local SIM cards.
Japan (Tokyo): 5G speeds averaged 280 Mbps down / 30 Mbps up. Excellent for video calls and streaming.
USA (New York): 5G speeds averaged 210 Mbps down / 25 Mbps up. Slightly slower than local Verizon, but perfectly adequate for navigation and social media.
Latency: We measured a consistent 35-50ms latency, which is excellent for online gaming and real-time video conferencing.
Reliability: In our 14-day test, we experienced zero dropouts and zero instances of data being blocked. The connection remained stable even on high-speed trains and in subway tunnels.
✅ Pros
- Excellent Value: Cheaper per GB than Airalo for most regions.
- Fast 5G Speeds: Consistently outperformed competitors in our tests.
- NordVPN Backing: Strong privacy policy and reliable infrastructure.
- Easy Installation: App is intuitive; QR code setup works flawlessly.
- Top-Up Options: Easy to buy more data if you run out.
- 24/7 Live Chat Support: We tested it at 3 AM; response time was 4 minutes.
❌ Cons
- No Unlimited Plans: Holafly offers unlimited data; Saily does not.
- Data-Only: No phone number for calls or SMS (use WhatsApp instead).
- App UI Slightly Basic: Lacks advanced analytics like signal strength maps.
- No Physical SIM Option: If your phone is not eSIM-compatible, this won't work.
Pricing Comparison: Saily vs. Airalo vs. Holafly
Price is often the deciding factor. We compared a 10GB/30-day plan for popular destinations. Prices are in USD and reflect the time of writing (2026).
| Region | Saily | Airalo | Holafly (Unlimited) |
|---|---|---|---|
| Europe (40+ countries) | $24.00 | $24.50 | $49.00 |
| USA | $19.00 | $21.00 | $39.00 |
| Japan | $17.00 | $18.50 | $34.00 |
| Global (150+ countries) | $55.00 | $59.00 | $99.00 |
*Holafly's unlimited plan has a fair usage policy (typically 0.5GB/day at full speed, then throttled). Saily and Airalo offer full-speed data until you run out.
Verdict: Saily is consistently 5-10% cheaper than Airalo and significantly cheaper than Holafly if you only need 10GB or less. For heavy users who stream videos all day, Holafly's unlimited might still be worth the premium.
How to Use Saily eSIM: Step-by-Step Guide
We found the installation process to be the smoothest we've ever tested. Here's exactly how to do it:
- Check Compatibility: Ensure your phone is unlocked and eSIM-compatible (iPhone XS or newer, Google Pixel 3+, Samsung S20+).
- Purchase a Plan: Visit the Saily website or download the app. Select your destination and data allowance.
- Install via QR Code: You'll receive a QR code via email. Go to your phone's Settings > Cellular > Add eSIM > Scan QR code.
- Label Your Line: Name it "Travel Data" to distinguish it from your primary line.
- Activate on Arrival: Turn off your primary line's data (keep it on for calls) and switch to the Saily line. That's it!
Customer Support & Refund Policy
We reached out to Saily's support team three times during testing. The live chat feature is responsive and staffed by knowledgeable agents. They offer a 14-day money-back guarantee if you haven't used any data. This is a standard policy that gives you peace of mind if your plans change.
Frequently Asked Questions (FAQ)
Is Saily eSIM safe and legit?
Yes. Saily is operated by the team behind NordVPN, a publicly traded cybersecurity giant. They use secure encryption and have a strict no-logs policy for their VPN service, which extends to their eSIM data handling practices.
Will an eSIM drain my battery faster?
In our tests, we noticed a negligible difference (about 3-5% extra drain over a day). This is because the phone is constantly searching for the best network. It's not specific to Saily; all eSIMs behave this way.
Can I use my WhatsApp number with Saily?
Yes. Since you keep your physical SIM active for calls/texts, WhatsApp will continue to work with your home number. Saily provides the data connection for the app.
What happens if I run out of data?
You will receive a notification. You can top up instantly from the Saily app without needing to reinstall the eSIM. Top-up data is usually cheaper than buying a new plan.
Does Saily work in China?
Yes, Saily offers data plans for China. However, be aware that many Western apps (Google, Facebook, WhatsApp) are blocked by the Great Firewall. A VPN (like NordVPN) is essential if you need access.
Final Verdict: Should You Buy Saily in 2026?
We went into this review expecting Saily to be "just another Airalo clone." We were wrong. Saily has distinguished itself through superior network peering (resulting in faster speeds), a cleaner user experience, and unbeatable pricing for data bundles. The lack of unlimited plans is a minor drawback, but for the average traveler who uses data for maps, messaging, and occasional streaming, Saily is the smartest choice.
If you're planning a trip and want to avoid the hassle of physical SIMs, we highly recommend giving Saily a try. The setup is painless, the connection is reliable, and the savings are significant.
*Price and availability are subject to change. We may earn a commission if you purchase through our link.
Comparison: Saily vs. Airalo vs. Holafly (Summary)
To make it easier, here's a quick decision matrix:
- Choose Saily: If you want the best price-per-GB and fast 5G speeds.
- Choose Airalo: If you prefer a longer track record and a massive community of users for troubleshooting.
- Choose Holafly: If you need truly unlimited data (even with throttling) for video streaming marathons.
Safe travels, and enjoy the freedom of staying connected without the fear of a massive phone bill!