How to Purchase a GS25 USIM and Activate an Affordable Phone Plan Online

To make your mobile communication more affordable, consider comparing various MVNO (Mobile Virtual Network Operator) plans.
MVNOs use the existing networks of the major carriers, providing the same quality and speed of service while reducing unnecessary costs. This allows them to offer plans that are 20-50% cheaper than those of larger companies, making them a cost-effective option.
This article will guide you through the process of purchasing a USIM at GS25 convenience stores and activating an affordable phone plan online.
Affordable Phone Plan Advantages

Purchasing a GS25 USIM

Setting Up Your Plan

Online Activation Steps
1. Affordable Phone Plan Advantages
Affordable phone plans offer several benefits:
Network
You can enjoy the same call quality and speed as major carriers, as they use the same networks.
Contract & Cancellation Fee
There's no fixed contract period, so you can use the service for as long as you want without cancellation fees.
Quick Activation
Apply on the online website, and you can get a new number in just 5-10 minutes.
Versatility
These plans can be used for various purposes, such as separating personal and work life, short-term or long-term projects, social media, sales, or promotions.
Device Compatibility
You can use your existing phone (used, unlocked, self-supplied, or even one that has been disconnected or suspended) simply by swapping the USIM card.
2. Purchasing a GS25 USIM
Visit any GS25 convenience store nationwide to purchase a USIM card compatible with affordable phone plans.
Baro USIM
These USIM cards are available at CU, Emart24, and GS25 convenience stores, making them easy to find. They are packaged in a mint-colored wrapper with a cat illustration, making them easily recognizable.
The USIM costs ₩8,800 and supports NFC, allowing you to use it as a public transportation card.
3. Setting Up Your Plan
Once you've purchased your USIM from GS25, you can choose a plan and apply online. Here are some popular unlimited data plans:
Prepaid Plans
✅ LTE 396
Monthly Fee: ₩39,600
Data: 10.3GB + 3Mbps
Calls & Texts: Unlimited
10GB is provided upon initial sign-up; only 0.3GB is available upon plan change.
✅ LTE 459
Monthly Fee: ₩45,900
Data: 20.3GB + 3Mbps
Calls & Texts: Unlimited
This plan is only available for new sign-ups.
Postpaid Plans
Receive a ₩5,000 coupon each month for Daiso, Olive Young, or CU.
✅ LTE 7GB
Monthly Fee: ₩21,100
Data: 7GB + 10GB + 1Mbps
Calls & Texts: Unlimited
Unlimited data for ₩20,000, with an additional 10GB provided as part of a promotion.
✅ LTE 11GB
Monthly Fee: ₩39,900
Data: 11GB + 2GB per day + 3Mbps
Calls & Texts: Unlimited
A high-data plan for ₩30,000, offering up to 71GB per month.
4. Online Activation Steps
Applications are accepted from 08:00 AM to 09:50 PM.
Go to Website
Click KT Network
Check Simple Authentication
Set Type
Enter USIM Code
Choose Plan
Select Number
Choose Payment Method
Confirm Happy Call
1. Go to Website
Click the banner to go to website.
Enter the website address into the address bar to access the homepage.
2. Click KT Network
The USIM purchased from GS25 is compatible with the KT network.
3. Check Simple Authentication
Verify with Kakao, Kookmin Bank, TOSS, Shinhan Bank, or PASS.
4. Set Type
Select New, Korean, and Prepaid or Postpaid in order.
5. Enter USIM Code
Remove the USIM from its packaging and enter the number starting with 8982 30 printed on the plastic SIM chip (excluding the letter F).
6. Choose Plan
Compare the data allowance and choose a plan based on your usage patterns.
7. Select Number
Enter the last four digits and choose your desired number from the list.
8. Choose Payment Method
Prepaid: Charge the monthly fee immediately.
Postpaid: Set up your payment method for the following month (enter card and account information).
9. Confirm Happy Call
Answer the Happy Call from the company (031 area code) for identity verification. Be sure to answer by 5 PM on the same day or 3 PM the next day, or your application may be canceled.
Now, anyone can easily activate an affordable phone plan online instead of visiting a physical store. Simply purchase a USIM at a nearby GS25 convenience store and apply online.
Applications can be submitted on weekdays, weekends, and holidays, making it highly accessible and convenient with a simple process. If you have any questions, feel free to ask for assistance.


















No comments yet.