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Traveler Guide 4 min read Updated for 2026 Travel

How to Use an eSIM Abroad

Using an eSIM abroad is simple, fast, and secure. Follow this step-by-step guide to install, configure, and activate your international eSIM before or upon arrival.

Key Takeaways
Install your eSIM QR code before departure while connected to home Wi-Fi.
Enable Data Roaming only on your UniSimCard eSIM line, not your home carrier line.
Set your cellular data source to the eSIM profile upon landing.
Keep your primary SIM line active to receive bank SMS and verification codes.

Step 1: Verify Device Compatibility & Unlocked Status

Before purchasing a travel eSIM, make sure your iPhone or Android device is carrier-unlocked and supports eSIM technology (iPhone XS and newer, Samsung Galaxy S20+, Google Pixel 3 and newer).

  • iOS: Settings > General > About > Carrier Lock (should say "No SIM restrictions").
  • Android: Settings > Connections > Mobile networks (look for "eSIM" or "Add mobile plan").

Step 2: Install Your eSIM Profile (Pre-Flight)

We strongly recommend scanning and installing your eSIM QR code before your flight while connected to stable home Wi-Fi.

  • iOS: Go to Settings > Cellular / Mobile Data > Add eSIM > Use QR Code.
  • Android: Go to Settings > Network & Internet > SIMs > Add SIM > Download a SIM instead.
  • Scan the QR code received in your UniSimCard confirmation email or app.

Step 3: Configure Dual-SIM Settings Upon Landing

When you land at your destination, switch your mobile data line to your UniSimCard eSIM profile and turn on Data Roaming for that specific line.

  • Set Primary Line: Keep your home SIM selected for Voice & SMS.
  • Set Data Line: Select your UniSimCard eSIM for Mobile Data.
  • Turn On Roaming: Enable "Data Roaming" ON for your UniSimCard line only.

Get Your Travel eSIM Now

Choose your destination and enjoy instant high-speed mobile data abroad.

UniSimCard Mobile App
Track real-time data usage and top up anytime on iOS & Android.