Connectivity comparison
| Option | Best fit | Check before buying |
|---|---|---|
| eSIM | Solo traveler with compatible phone | Unlock status and model support |
| Physical SIM | Voice number or simpler compatibility | SIM size, plan and phone setup |
| Pocket Wi-Fi | Group staying together | Battery, return and separation risk |
Decide whether you need a Korean number
Data is enough for maps, messaging and most browsing. A local number can matter for reservations, delivery calls and some customer-service interactions, but a temporary number does not guarantee access to services that require verified resident identity.
This distinction prevents a common disappointment: buying a product advertised with a Korean number and expecting it to unlock resident-only identity verification.
Compare the real constraints
An eSIM avoids a physical swap but requires a compatible, unlocked phone. A physical SIM is widely understood and may include voice, but installation changes your current SIM setup. Pocket Wi-Fi can serve multiple devices, while adding a battery, charger and shared point of failure.
- Check the exact phone model, not only the model family.
- Confirm whether tethering is permitted.
- Read the fair-use or speed-reduction conditions.
- Know when the activation period begins.
- Keep the QR code or setup instructions offline.
Test before leaving the airport
If you collect or activate connectivity at the airport, open a map and load a new webpage before leaving the service area. A visible signal icon alone does not prove that data works.