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No phone for a Korean prepaid SIM?|Bring your own device or buy a used phone

Published · 2026.10.09 · Saessak Mobile

Prepaid SIM basics
No long-term contract is required. Service is available in periods of at least 30 days. Foreign customers can apply with a Residence Card or passport. If you do not top up for the next period, service is suspended and the number is later terminated under the carrier policy. Identity-verification availability can vary by registration details and the service used.

A prepaid SIM provides a phone number and mobile service, but you still need a phone to make calls, receive messages and use data. Bring an unused phone from home or the phone you plan to use. If you do not have one, contact Saessak Mobile before visiting to ask about used phones currently available for purchase.

Bring these three things

  1. The phone you plan to use: Bring an unused device or the actual phone that will hold the SIM.
  2. Identification: Korean customers should bring a national ID card or driver’s license. Foreign customers should bring an Alien Registration Card or passport.
  3. Your intended use: Tell us whether you need identity verification, calls and messages, how much data you expect to use and for how long.

If you already have a phone

Bring the phone together with your identification. The store will check whether the SIM can be used in the device before activation. It is not always possible to decide from the model name alone, so bringing the actual phone is the fastest way to check.

If you do not have a phone

You can check the used phones currently available at Saessak Mobile and prepare one together with the prepaid SIM. Models and prices depend on stock at the time of your visit, so call before coming.

Choose a plan based on how you will use it

  • Pay-as-you-go plan around KRW 5,000: Identity verification, incoming messages and calls
  • Around KRW 36,000: 300MB followed by 3Mbps
  • Around KRW 39,000: 15GB followed by 3Mbps
  • Around KRW 66,000: 100GB followed by 5Mbps

You do not have to select a phone before choosing a plan. Tell us how you will use the number and how much data you need so we can compare suitable prepaid plans together with the phone options.

Ask about a prepaid SIM even when postpaid activation is difficult

  • A foreign customer needs a Korean number using an Alien Registration Card or passport
  • You want to use the service in 30-day periods without a long contract
  • You mainly need to keep a number for verification or incoming contact

Saessak Mobile in Seomyeon, Busan

If you already have a phone, bring the actual device. If you do not, ask about used-phone stock before visiting.

  • Address: 부산광역시 부산진구 새싹로 28
  • Phone: 010-6386-9959
  • Hours: Monday–Saturday 10:00–20:00
  • Closed Sunday

SIM compatibility, used-phone models and prices are checked using the actual device and the stock available at the time of the visit. Activation eligibility is decided after identity verification and a review of the carrier’s current policy.


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