SIM Card vs eSIM vs Pocket Wi-Fi — Which Is Best for Your Trip?
Compare the three main data options for international travel: physical SIM, eSIM, and portable Wi-Fi.
Stay connected abroad without paying roaming rates
Three main options exist for international data: eSIM, physical SIM card, and pocket Wi-Fi. Each suits different traveller types. Picking the wrong one can mean high costs or an inconvenient trip.
1. eSIM — The Modern Choice
Most Popular
Purchase online, receive a QR code by email, and scan to activate — no physical chip needed. Works as a second SIM alongside your Korean number.
- 👍 Keep your Korean number active for calls/texts while using eSIM data
- 👍 No airport pickup queue — activate from home
- ⚠️ Only supported on newer phones (iPhone XS+, Galaxy S23+, etc.) — check your device first
2. Pocket Wi-Fi — Best for Groups
Rent a portable router that up to 5 devices can connect to simultaneously. Most cost-effective when travelling with 3+ people.
- 👍 Split cost between group members — very economical
- ⚠️ Must carry the device and charger everywhere; range limited
- ⚠️ If the device-holder splits from the group, others lose connection
3. Physical SIM Card — Most Reliable
Swap your Korean SIM for a local carrier's chip. Excellent coverage and speed, but means losing access to your Korean number while abroad.
- 👍 Direct connection to local network — fastest and most stable
- ⚠️ Switching chips on a plane is fiddly; risk of losing your Korean SIM
- ⚠️ Korean number receives no calls/texts while Korean SIM is out
Quick Comparison
| eSIM | Pocket Wi-Fi | Physical SIM | |
|---|---|---|---|
| Best for | Solo / couple | Groups 3+ | Older phones |
| Keep Korean number | ✅ Yes | ✅ Yes | ❌ No |
| Device needed | None | Router | None |