Airalo vs 3HK vs Flexiroam: The Ultimate Travel eSIM Review

Published: 2 August 2026 | Category: Comparison

1. The New Travel Norm: Why is Everyone Switching to eSIMs?

In the past, the most annoying part of travelling for leisure or business was scrambling to find a local SIM card shop right after landing, or lugging around a heavy "Wi-Fi egg" router that needed charging every day. Not to mention the hassle of losing your original Hong Kong SIM card and having to replace it when you get back. Thanks to tech advancements, eSIMs (embedded SIM cards) have become the go-to choice for Hong Kong travellers. Just a few taps on a mobile app to buy a plan before you fly, and you're online the moment you land—no need to swap physical cards. It really saves a ton of time and hassle.

Why are eSIMs so popular? Here are the main advantages:

• Instant Activation: No need to wait for a physical card in the mail or queue up at a store. Buy it anytime, anywhere, and scan a QR code to activate it instantly.
• Keep Your Original Number: You can keep your physical CSL, SmarTone, or HKBN SIM card in your phone to receive SMS. Getting WhatsApp verification codes or doing online banking transfers is a breeze.
• Eco-friendly & Convenient: No need for a SIM ejector tool, no extra plastic waste, and no fear of dropping that tiny physical SIM card.
• Flexible Switching: If you're travelling across Europe, you can easily switch between different eSIM profiles in your phone settings for seamless connectivity across borders.

With so many options on the market, we've picked the top three eSIM giants most popular among Hongkongers: Airalo, 3HK Discover, and Flexiroam. We've done an in-depth review and comparison to see which one best suits your travel needs!

2. Background & Features of the Big Three: Airalo, 3HK, and Flexiroam

Before diving into the detailed speed and price tests, let's look at the backgrounds and main selling points of these three brands. While they all sell eSIMs, their operating models and strengths differ. Knowing what they're good at makes it much easier to pick the right data plan for your itinerary.

First up is Airalo, arguably the world's first and currently largest eSIM store. Its strength lies in covering over 200 countries and regions. The app interface is brilliantly designed, feeling much like browsing a supermarket, categorised into local, regional (e.g., all of Europe, all of Asia), and global plans. No matter how obscure your destination is, you can usually find a corresponding data pack on Airalo.

Next is 3HK Discover, a brand Hongkongers are very familiar with. This is actually a roaming product under Hutchison Telecom, often referred to as the travel version of the 3HK DIY prepaid card. Its biggest advantage is being operated by a major local telecom provider. The data is often routed through Hong Kong servers, meaning even when you're browsing abroad, your IP address remains in Hong Kong. This is super convenient for watching ViuTV or using apps restricted to HK IPs.

Finally, there's Flexiroam, a tech company focused on global roaming. They used to specialise in microchips that stuck onto physical SIM cards but have now fully transitioned to eSIMs. Flexiroam's strengths are cross-border roaming and global plans. If you're a frequent business flyer, their global data packs offer extensive coverage and frequent flash 50% off sales, making them incredibly cost-effective.

3. Speed & Coverage Tests in Popular Destinations

The biggest fear when buying an eSIM is getting no signal or turtle-like speeds upon arrival. We've gathered tons of real user data and our editors' first-hand test results from Japan, Korea, Taiwan, and Europe to break down how these three providers perform. Overall, they all do quite well in major cities, but the differences become obvious when you head to remote areas or ride the Shinkansen/high-speed rail.

Take Hongkongers' favourite destinations, Japan and Korea, for example: Airalo usually connects to KDDI or SoftBank in Japan, offering buttery smooth 5G in downtown Tokyo and Osaka—even streaming 4K YouTube is flawless. 3HK Discover often roams on Docomo in Japan, boasting excellent coverage that reaches even the rural parts of Hokkaido. However, because the routing goes back to Hong Kong, the Ping (latency) can be slightly higher, which might slightly affect gaming. Flexiroam wins by automatically switching to the strongest local network; if network A drops, it jumps to network B, making it highly stable.

• Japan/Taiwan/Korea Tests: 3HK Discover has the most balanced coverage, Airalo is the fastest in cities, and Flexiroam is the most flexible at network switching.
• Multi-country Europe (e.g., UK, France, Germany, Italy) Tests: Airalo's Eurolink regional plan performs at a god-tier level, with cross-border network switching usually taking just 1-2 minutes. Flexiroam's Europe plan is also very stable, especially great for long-haul train journeys. 3HK's speeds in Europe are relatively slower, sometimes dropping to 3G/4G, and routing data back to HK causes higher latency.
• Southeast Asia (Thailand/Vietnam): All three perform similarly, but 3HK's APAC plan usually offers the best bang for your buck.

If you mainly use data for Google Maps, replying to WhatsApps, and scrolling IG, all three are absolutely sufficient. But if you need to do video conferencing or live streaming, we recommend Airalo or Flexiroam for Europe and the US, while 3HK Discover is a solid choice for Asia.

4. Setup Difficulty & Customer Service Showdown

For those who have never used an eSIM, the biggest worry is definitely "not knowing how to set it up." In reality, eSIM setup is pretty idiot-proof nowadays, but the user experience (UX) still varies between apps.

Airalo's app experience gets a perfect score. The entire flow from buying a plan to installation is crystal clear. It even supports Direct Installation within the app, so you don't even need to scan a QR code—perfect for users who only have one phone on hand. Plus, it has detailed tutorials teaching you step-by-step how to turn on data roaming. The only downside is that customer service relies heavily on an in-app chatbot, and waiting for a human reply can sometimes take half a day.

3HK Discover's process is relatively traditional. While you can buy online, the website and app design feel more like a traditional telecom provider, sometimes requiring you to tap through multiple menus to find a plan. However, its biggest perk is having local Hong Kong customer service! If you're stuck abroad, you can directly contact 3HK's online support or ask family in HK to call the hotline. Speaking the same language makes solving problems much faster.

Flexiroam's interface is professional and clear. It also supports one-tap in-app installation and offers WhatsApp customer support. You can WhatsApp them directly if you have issues, and their reply speed is quite fast. The Flexiroam app also clearly displays your remaining data and mileage (they have some partnership programs), which is super helpful for managing your data.

5. Price, Value for Money & Hidden Fees

At the end of the day, what Hongkongers care about most is the price! We've converted the plans from all three companies into HKD ($) for an at-a-glance comparison. It's worth noting that their charging models differ slightly: Airalo and Flexiroam mainly sell "fixed data volumes" (e.g., 10GB / 30 days) that stop when used up—there's no such thing as throttled unlimited data here. Meanwhile, 3HK Discover offers daily plans (like a 24-hour pass) that include a set amount of full-speed data followed by unlimited throttled data.

*Note: The countries covered by 3HK's 365-day Global Pass might differ from the other two. Please verify your destination before purchasing.

Price-wise, if you're only visiting one country (like just Japan), Airalo's single-country plans are usually the cheapest and best value. But if you're doing a multi-country APAC trip, 3HK's APAC Pass offers great value for money. As for Flexiroam, while their regular prices can be a bit steep, as mentioned earlier, they frequently run massive 50% or even 70% off sales during holidays. If you catch a sale and buy it to keep in your account (to activate within 6 months), it can easily be the cheapest option!

Summary: Which One is Right for You?

After looking at all these tests and comparisons, you should have a solid understanding of these three eSIMs. Truth is, none of them is absolutely perfect; it all comes down to your travel habits and destinations. Let's wrap things up and help you match with the right data solution:

1. Airalo is best for "Beginners & Single-Country Deep Travel": If you've never used an eSIM and are afraid of messing up the setup, Airalo's flawless app experience will definitely save you. For trips to Japan, Korea, Taiwan, or a single European country, their Local Plans are cheap and offer guaranteed speeds—a very safe bet.
2. 3HK Discover is best for "HK IP Needs & APAC Travellers": If you need to catch up on ViuTV dramas every night, use the HKJC app, or want to bypass the firewall for IG/WhatsApp in Mainland China, 3HK's Hong Kong IP routing is unbeatable. Plus, having HK customer service means you've got backup if things go wrong.
3. Flexiroam is best for "Frequent Business Flyers & Bargain Hunters": If you fly to multiple countries a year, or are heading to less common destinations like South America or Africa, Flexiroam's global coverage will give you peace of mind. Just remember to snag their 50% off deals for maximum value.

We hope this review and comparison helps you pick the perfect travel eSIM. Wishing you a fantastic trip with seamless connectivity!