How to Purchase a GS25 USIM and Activate an Affordable Phone Plan Online
MVNO phone plans are an increasingly popular choice for people who want to lower their monthly mobile bills without compromising network quality. By using the same infrastructure as major carriers, these plans provide stable calls and data at a much lower cost.
This post explains, step by step, how to buy a USIM at GS25 and activate an affordable phone plan online, using real examples of plan options, setup flow, and practical tips.
Why MVNO Phone Plans Are Worth Considering
MVNO operators lease networks from major carriers, meaning call quality and data speed are essentially the same as standard plans.
Because they cut marketing and operational costs, MVNO plans are typically 20 to 50 percent cheaper, making them ideal for cost-conscious users.
Key Benefits of Affordable Phone Plans
There is no long-term contract, so you can cancel or switch plans freely without worrying about penalties.
Online applications allow you to activate a new number in just five to ten minutes.
These plans are useful for separating work and personal numbers, short-term projects, business use, or promotions.
Most unlocked or previously used phones can be reused simply by replacing the USIM.
Buying a USIM at GS25 Convenience Stores
You can purchase a compatible USIM at GS25 stores nationwide, without visiting a telecom shop.
The Baro USIM is also available at CU and Emart24. Its mint-colored package with a cat illustration makes it easy to identify.
The USIM costs 8,800 won and supports NFC, allowing it to be used as a public transportation card.
Selecting the Right Affordable Phone Plan
Once the USIM is purchased, you can apply for a plan online based on your data usage and budget.
Popular Prepaid Plan Options
LTE 396 costs 39,600 won per month and provides 10.3GB of data plus unlimited usage at 3Mbps, along with unlimited calls and texts.
LTE 459 costs 45,900 won per month and offers 20.3GB of data plus unlimited speed at 3Mbps. This plan is available only to new subscribers.
Popular Postpaid Plan Options
Some postpaid plans include a monthly 5,000 won coupon usable at stores such as Daiso, Olive Young, or CU.
The LTE 7GB plan costs 21,100 won and includes 7GB plus an additional 10GB promotion, with unlimited data at 1Mbps.
The LTE 11GB plan costs 39,900 won and offers 11GB plus 2GB per day, allowing up to 71GB per month.
Step-by-Step Online Activation Process
Online activation is available every day from 8:00 AM to 9:50 PM, including weekends and holidays.
Access the website, select the KT network, and complete simple authentication using Kakao, PASS, or supported banks.
Choose a new Korean number, select prepaid or postpaid, and enter the USIM code printed on the SIM card starting with 8982 30.
Select your plan, choose the last four digits of your number, and register your payment method.
Finally, answer the confirmation call from the 031 area code within the given time frame to complete activation.
A Simple Way to Cut Monthly Mobile Costs
With just a USIM from GS25 and an online application, anyone can switch to an affordable phone plan without visiting a store.
The process is quick, flexible, and accessible every day, making MVNO plans a practical solution for modern mobile users.
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