Travelling to South Korea? SIM-only plans with international roaming are a convenient way to get data overseas without having to buy an eSIM or swap to a tourist SIM card. We’ve analysed the most competitive plans from Singapore to provide the absolute best options for your trip.
The Maxx 5G plan offers exceptional value, providing a very generous 7GB roaming allowance for only $12/mth, supplemented by competitive $6 add-on data packs; which is often more than sufficient for general use during a 3-5 day Korea trip, given the widespread availability of high-speed public WiFi for heavier data tasks.
For users that are looking for the most roaming data in Korea no questions asked, SIMBA and GOMO offer 80GB and unlimited options respectively. However, these are much more costly at $25/month and $50/month.
The good news is, no matter what you choose, there are a good amount of affordable SIM plans with Asia roaming benefits to keep you connected as you explore South Korea!
| Provider |
Price |
Roaming Data for Korea |
Data Coverage Region |
Partner Network in Korea |
Add-on Packs for Extra Data |
| Maxx 5G |
$12/mth |
7GB |
International Roaming |
KT Corporation / LG Uplus / SK Telecom |
$6 for extra 1GB of data (valid for 21 days) |
| eight 5G Lucky Eight Plan |
$14.80/mth |
8GB |
International Roaming |
SK Telecom / KT Corporation |
$3.88 for extra 1GB of data (validity not stated) |
| MyRepublic 5G |
$19.95/mth |
4GB |
International Roaming |
SK Telecom |
$14.0 for extra 1GB (validity not stated) |
| giga! 5G |
$20.37/mth |
12GB |
Asia Roaming |
SK Telecom / KT Corporation |
$5 for extra 1GB of data (valid for 5 days) |
| SIMBA 5G |
$25/mth |
80GB |
APAC Roaming |
KT Corporation / LG Uplus |
None |
| GOMO 5G+ Global Infinity |
$50/mth |
Unlimited (25GB before throttling) |
Worldwide Data Roaming |
SK Telecom / KT Corporation |
From $6 (Data and validity not stated) |
* All pricing and information retrieved on 10 November 2025
If you want to find an affordable 5G SIM with roaming for your trip to Korea, you might be asking how much data is enough. South Korea has an internet penetration rate of 97.4% and mobile connections equivalent to 134 percent of the total population in 2025, which means it is extremely well connected.
You’ll find plenty of Wi-Fi coverage in major cities like Seoul, Busan or Incheon, with free hotspots in common public spaces like subways, shopping malls and cafes, so your data usage might end up lower than you think! On the flip side, your data needs will be higher if your travel itinerary involves more remote destinations without Wi-Fi like Damyang or if you’re visiting national parks like Seoraksan, so plan accordingly.
Here’s a rough idea of the total data usage you might rack up for your trip.
| Type of User |
Typical Daily Activities |
Estimated Total Data Usage for a 7 Day Trip |
| Light User |
Messaging, checking emails, 30 min navigation/day, Wi-Fi use in hotels. |
1GB - 3GB |
| Moderate User |
Daily social mediause (2+ hours), posting 3-4 photos/day, listening to music on the go. |
5GB - 10GB |
| Heavy User |
Multiple video calls (1 hr+), frequent social media video uploads, streaming Netflix on commutes. |
10GB - 15GB+ |
How Does the Roaming Coverage Region Affect My Data Cap and Add-on Costs in South Korea?
If you look at a 5G SIM with data roaming for travel, you might come across terms like “Local Roaming”, “APAC Roaming” or “International Roaming”. These are known as roaming coverage regions and can affect your total data capacity and the cost of add-on data packs.
Because providers may classify Korea under different regions, you must check which region Korea falls under on your specific plan to know your data roaming limit. At the same time, it is typically cheaper to buy an “APAC” or “Asia” roaming pack, compared to an “International” roaming pack, which can work out to be cheaper overall if you find yourself having to top up in the middle of your trip.
What are Partner Networks in South Korea and How Do They Affect Your SIM-Only Plan with Data Roaming for Korea Travel?
Most international roaming data phone plans collaborate with partner networks at the destination country which are responsible for providing you with local data coverage. When you roam, your SIM-Only plan connects to one of the three major Mobile Network Operators (MNOs) in Korea. They are:
- SK Telecom (SKT): The largest operator and often cited as having the most extensive coverage, particularly in more remote areas and across the country's subway lines.
- KT Corporation: Highly regarded for fast speeds and a very stable partner for many international roaming providers.
- LG Uplus (LGU+): Offers robust performance in major cities and transportation hubs.
These are many convenient and quality-of-life benefits to SIM-only plans with international roaming for travel to South Korea:
- Get Connected When You Land: You land at Incheon Airport and you have instant internet access. No need to queue for a Korea travel sim at the airport counter or hunt for Wi-Fi.
- Security for Banking and Apps: You keep your original home SIM active to receive crucial One-Time Passwords (OTPs), bank alerts, and authentication messages.
- Maintain Contact with Those at Home: Your home number stays active for incoming calls and texts, allowing family and contacts to reach you without using international dialing codes.
Reviewing a list of Singapore mobile plans with global data roaming included for your Korea trip? Consider these factors before you make your choice:
The most effective way to choose a cost-efficient plan is to be honest about how you use data. Don’t pay for an unlimited data SIM-only plan if your habits are actually quite light.
Besides the cost of the monthly plan, you should also factor in the cost of top-ups in the worst-case scenario that you run out of data. Look for providers that offer cheap booster packs instead of defaulting to expensive pay-as-you-use charges.
Check the fine print because some plans might be 5G at home but only connect at 4G speeds on the overseas network. If you need the absolute fastest speed for tasks like video calling or heavy streaming in Seoul, you want a plan that guarantees 5G access from the Korean partner network. You should also check if your provider will throttle your speed after you hit a certain daily or monthly limit. This sudden drop can be frustrating when you rely on fast speeds for navigation or transport apps.
The major benefit of a SIM-Only plan is convenience. Opt for providers that allow activation and management (like buying top-ups or checking usage) directly through their mobile app. This is far more user-friendly than dealing with complicated SMS codes or needing to call customer service when you're already in Korea.
Frequently Asked Questions About SIM-Only plans with Data Roaming for Korea Travel
