Can I change phones while using a prepaid SIM in Korea?｜How to move and check your SIM
In most cases, you can move your current prepaid SIM to a new phone and continue using the same number. You may still need to check the SIM size, phone compatibility and whether a SIM protection service is active.
Check these points before moving the SIM
- SIM size: Most recent smartphones use a Nano-SIM.
- New phone status: Check that the device was properly released from its previous contract and supports Korean mobile networks.
- SIM protection service: If this service is active, the SIM may be restricted when inserted into another phone.
- Personal data: Moving the SIM does not automatically copy photos, contacts or apps to the new phone.
How to move the SIM to another phone
- Turn off both phones. Do not force the SIM out while the phone is powered on.
- Remove the SIM tray from the old phone. Insert the ejector pin straight into the tray hole and press gently.
- Place the SIM in the new phone’s tray in the correct direction. Do not push the tray in by force if the SIM is not seated correctly.
- Turn the phone on and test calls, messages and mobile data. On a Galaxy phone, you can check the carrier under Settings → About phone → Status information → SIM card status.
If the phone does not recognize the SIM
| Problem | What to check first |
|---|---|
| No carrier is displayed | Restart the phone and reinsert the SIM in the correct direction. |
| The SIM only fails in another phone | Check whether the carrier’s SIM protection service is active. |
| The SIM is loose or damaged | Do not use a hand-cut SIM; check whether the SIM needs to be reissued. |
| Overseas or older phone | Check whether the device supports Korean networks and the correct SIM size. |
Avoid touching the metal contacts of the SIM with your fingers or a metal object. If they are dirty, wipe them gently with a dry cloth. Never force the SIM or tray into the phone.
If you need help moving the SIM
Bring both your old phone and the phone you plan to use so the SIM size and recognition status can be checked more easily. If a SIM replacement or subscriber verification is required, please also bring your own identification document.
If you do not have a new phone, you can also ask about the used phones available at the store. Models and stock may change by the time of your visit.
Saessak Mobile in Seomyeon, Busan
- Address: 부산광역시 부산진구 새싹로 28
- Phone: 010-6386-9959
- Hours: Monday–Saturday 10:00–20:00
- Closed Sunday
Bring your current SIM and both phones for a quicker check at the store.
References: Samsung SIM recognition troubleshooting, SIM types and installation