Korea Code

Travel Basics

Connectivity & Apps

Choose a connection that fits your phone and trip, check voice and roaming conditions, and prepare a route you can use without data.

Source-based desk guide · sources checked 2026-10-16. Not a firsthand visit report. Reference links below; send corrections through Contact.

Start with the task, not the advertised price

List what you need: maps and messages, calls to accommodation, a number for reservations, or internet for several people. Compare the full trip cost of your home roaming plan, a local SIM or eSIM, and a shared Wi-Fi device. There is no single cheapest option for every visitor. Do not buy a second plan before checking what your existing subscription includes.

Check the exact device before buying

An eSIM-capable model name alone is not enough: check the device’s purchase region and carrier lock. Apple requires an unlocked iPhone to use another carrier and documents regional differences. For other phones, use the manufacturer’s model-specific instructions. Confirm compatibility with the provider before paying.

Put these questions beside each quote

  • When does the validity period begin: installation, activation or first connection?
  • Does the plan include calls and SMS, or only data? Is identity verification required?
  • What happens after the high-speed allowance? Is hotspot sharing allowed?
  • What are the refund, replacement and support arrangements if setup fails?

Separate data from calls and verification

Data access does not by itself promise a usable local number or identity verification for Korean services. KT states that its voice/SMS services require its entry verification procedure. Check the specific product and the service you intend to register for; a tourist number is not a guarantee that every registration will work.

Keeping your home line active can still incur roaming charges. Check its call and SMS terms, choose the intended data line and review automatic data switching. Follow the travel provider’s roaming setting instructions for that line; do not apply one switch to every SIM. Test an essential login before leaving home rather than assuming its verification message will arrive abroad.

Plan for people who split up

For a pair spending the entire day together, compare a shared device with two individual plans. If one person leaves early or takes another route, decide how both will contact the accommodation. Add charging, collection and return arrangements to the shared-device comparison. This planning example is not a recommendation for a particular provider.

Prepare the last kilometre without a connection

Save the accommodation name and Korean address, booking reference, arrival instructions and a meeting point offline. Preview the route in your chosen map app and check the exact entrance, station exit and final walk. Recheck routes on the travel day; this guide does not rank one app as universally accurate.

Uber lists taxi requests in Seoul. Check vehicles, pickup instructions and payment options for your actual origin; availability is not a guaranteed pickup. Keep a taxi rank or accommodation-assisted alternative. Avoid putting an activation deadline between landing and a non-refundable booking.

If setup fails

A short recovery sequence

  • Use a trusted connection to open the provider’s instructions and confirm the selected data line.
  • Keep the order reference and exact error for support; do not share activation QR codes publicly.
  • Do not delete the eSIM profile until the provider confirms how to reinstall it.
  • Use the saved arrival instructions while resolving the connection, rather than buying another plan immediately.