A smartphone showing a VPN Connected shield beside a glowing eSIM chip and passport on a desk with a cyan world-map background
One eSIM for data, one VPN for security — the only two apps you need before you fly

Planning a trip to Asia is genuinely exciting. Whether you're eating your way through Taipei's night markets, island-hopping the Philippines, or working remotely from a beach in Bali, the checklist is long. But amid the flights and the packing, one thing too many travellers leave until the airport gate: digital connectivity and security.

Rely on your home carrier's roaming and you're looking at eye-watering daily fees. Rely entirely on public Wi-Fi and you're opening yourself up to cyber risks and frustratingly patchy speeds. To stay connected smoothly and securely across borders, you want a dynamic duo in your digital pocket: an eSIM and a VPN. Pairing Saily for global data with NordVPN for privacy and unblocking is, in our view, the cleanest travel setup for Asia. Here's exactly why they belong together.

🌏 Seamless borders meet unrestricted access

Asia is an incredible patchwork of cultures — and of digital borders. Crossing from Thailand into Cambodia changes your cellular network completely, and regional internet rules mean some of your favourite apps can suddenly stop working the moment you cross a line on the map.

🛡️ Guarding your data on public Wi-Fi

An eSIM gives you local cellular data, but you'll inevitably hop onto public Wi-Fi at cafés, hotels and train stations to save your allowance or download something heavy. Café culture is huge across hubs like Seoul, Tokyo and Bangkok — and unencrypted open networks are a playground for "man-in-the-middle" attacks, where someone on the same network intercepts your passwords, bank details and emails.

Because Saily and NordVPN are both built by Nord Security — the same company behind NordVPN's 100M+ users — they sit together neatly. Saily keeps you off unverified local networks by giving you affordable cellular data in the first place, while NordVPN acts as an encrypted tunnel for the times you do use public Wi-Fi. It scrambles your traffic so that even if someone is monitoring the café network, all they see is gibberish.

💡 Quick rule of thumb: use your eSIM data for anything sensitive — banking, logins, payments. If you must use open Wi-Fi for those, switch the VPN on first.

🔐 Beating location-based app lockouts

Ever tried logging into your banking app or streaming service from a brand-new continent? Many security systems flag sudden logins from foreign IP addresses as fraud and lock you out — usually right when you need to pay for a hostel or book a domestic flight.

Pairing Saily's reliable connection with NordVPN's server network lets you set your virtual location to your home country. Your bank, your Netflix account and your work email behave as if you never left your living room — sparing you frozen accounts and endless two-factor loops while you're on the road.

A smartphone showing a café Wi-Fi connection secured with a glowing padlock, beside a passport and coffee on a desk with a cyan world-map background
On café and hotel Wi-Fi, a VPN turns an open network into an encrypted tunnel

🤝 The duo, side by side

You don't need both to be from Nord Security — any reputable eSIM and VPN will do the job. But the Saily + NordVPN pairing is the easiest to recommend because the two are designed by the same team and bill under the same ecosystem. Here's how each earns its place on your phone.

NordVPN

The VPN · Privacy & Unblocking

The privacy half of the duo. NordVPN encrypts your traffic on untrusted networks, lets you set your virtual location to bypass blocks and unlock home streaming, and runs on its lightweight NordLynx protocol (built on WireGuard) so battery drain is negligible. One subscription covers your phone and laptop.

Servers6,000+ worldwide
ProtocolNordLynx (WireGuard)
DevicesUp to 10 at once
ChinaObfuscated servers

Pros

  • Strong encryption on public Wi-Fi
  • Unblocks home streaming & apps
  • Lightweight, low battery use

Cons

  • Mainland China needs setup first
  • Separate subscription to the eSIM
Get NordVPN →

⚙️ How to set it up before you fly

Getting your digital toolkit ready takes less than ten minutes — and the golden rule is to do it on home Wi-Fi before you leave, not at the destination.

1
Check compatibility
Make sure your phone is carrier-unlocked and supports eSIM (most handsets from 2020 onward do). Unsure? See our device compatibility guide.
2
Get your VPN
Sign up for NordVPN and install the app on both your phone and laptop while you're still at home.
3
Grab your eSIM
Head to Saily, search for the Asian countries you're visiting (or a regional Asia plan), and buy your data package.
4
Activate safely
Install the Saily profile using the in-app instructions before you fly, then switch NordVPN on the moment you connect to the internet at your destination.
⚠️ Heading to Mainland China? The "Great Firewall" blocks standard VPN protocols — the default NordLynx (WireGuard) tunnel is detected and dropped within seconds. Enable NordVPN's Obfuscated Servers and test the connection before you cross the border, because setting one up once you're behind the firewall is very difficult.
The bottom line
Two apps, sorted before takeoff — then you can forget about them.

Travelling through Asia should be about hidden street-food stalls and ancient temples, not lost signals, hacked passwords or blocked websites. Download Saily for instant, affordable data and secure it with NordVPN, and you've guaranteed yourself a stress-free digital experience from the bustle of Tokyo to the beaches of Thailand. Safe travels.

🙋 Frequently asked questions

Q.Does using a Saily eSIM change my WhatsApp or phone number?
No. A travel eSIM handles data only. Your physical SIM or primary eSIM — your home number — stays active in the background, and your phone treats them as two separate lines. WhatsApp, iMessage and Signal stay tied to your original number automatically. You don't have to change a single app setting.
Q.Is using a VPN actually legal in Asia?
Yes, in the vast majority of Asian countries. Using a VPN like NordVPN is completely legal and widely encouraged for cybersecurity in popular hubs such as Thailand, Vietnam, Indonesia, Japan, South Korea and the Philippines. The one major exception is Mainland China, where VPN use is heavily regulated and the Great Firewall blocks many standard protocols — so download NordVPN and switch on its Obfuscated Servers before you arrive.
Q.Can I use NordVPN to watch my home Netflix from Asia?
Absolutely. Streaming platforms use your IP address to decide which library to show. Sat in a hotel in Bali, you'd normally only see the Indonesian catalogue — but tap a NordVPN server in your home country (US, UK, Australia and so on) and the app unlocks your usual shows as if you never left.
Q.Will running a VPN drain my phone battery while I'm out exploring?
Barely. NordVPN's NordLynx protocol is built on WireGuard and designed to be lightweight. Any active background app uses a fraction of power, but the impact here is negligible — you'll burn far more battery on photos and Google Maps than on a VPN running quietly in the background.
Q.What happens if I run out of data on my Saily plan mid-trip?
Topping up is painless. You don't need a new eSIM profile or another QR code — just open the Saily app, select your active eSIM, choose how many gigabytes to add, and pay. The extra data attaches to your current profile instantly.
This guide contains affiliate links. If you buy a plan through them we may earn a commission at no extra cost to you — it never influences our recommendations, which are based on independent research.