Mobile phone setup: prepaid SIM, postpaid plans, and identity verification

A guide to choosing a Korean phone setup and avoiding identity verification problems after arrival.

A working Korean phone number helps with maps, banking, delivery, hospital reservations, and identity verification. Short-term visitors often start with a prepaid SIM or travel eSIM, while long-term residents may move to a postpaid plan after residence card registration. Before choosing a plan, check data limits, contract length, cancellation fees, hotspot rules, and whether the number supports Korean identity verification. Some app signups require a name and phone record that exactly match your registered identity. If you later receive a residence card or change your name format, ask the carrier how to update subscriber information. Keeping phone, bank, and immigration records aligned prevents many authentication problems.