Expert Summary
"Observed Network Stability During Seollal Week"
This week's monitoring period coincided with the Seollal (Lunar New Year) holiday. Despite shifts in traffic patterns typical of national holidays, measurements collected during defined holiday time windows did not show measurable performance degradation on the SKT local LTE network.
Across tested locations, connectivity remained stable for typical travel applications, including navigation, messaging, translation apps, and social media uploads.
For two consecutive weeks, recorded download speeds across primary Seoul test points exceeded 100 Mbps during monitored sessions, indicating consistent throughput under urban peak conditions.
Indoor testing at major commercial complexes, including The Hyundai Seoul and Mecenatpolis Mall, showed no service interruptions and consistently strong download performance. However, elevated upload latency was observed in select high-density indoor zones.
Weekly eSIM Performance Index
Download performance
Seamless
Upload performance
Seamless
7-day trend
Overall status
Seamless
Minor delay under heavy upload
Overall stability
High
Usage readiness
Routing behavior
Native-dominant
Traffic primarily handled within local network paths
Regional Average Performance
This table represents the average connectivity health across major hubs during the third week of February.
| Location | Status | Speed | Responsiveness | |||
|---|---|---|---|---|---|---|
|
Download (Mbps) |
Upload (Mbps) |
Idle (ms) |
Download (ms) |
Upload (ms) |
||
| Hapjeong Station | Seamless | 106 | 47.8 | 34.5 | 43 | 730.5 |
| Hongdae Red Road | Seamless | 99.4 | 55.9 | 38.67 | 71.67 | 641 |
| Seoul City Hall | Seamless | 131 | 37.3 | 44 | 214 | 116 |
eSIM Connectivity Benchmarks by Day
Daily tracking results to show network stability. Monitoring is conducted during weekday peak hours to provide the most conservative and realistic performance data for travelers.
| Date | Location |
Download Speed (Mbps) |
Upload Speed (Mbps) |
Ping (ms) |
|---|---|---|---|---|
|
MON
02/16/2026
|
Hongdae Red Road | 🟢 101 | 🟢 58.5 | 🟢 39 |
| City Hall Station | 🟢 131 | 🟠 37.3 | 🟠 44 | |
|
TUE
02/17/2026
|
No data collected (Holiday) | |||
|
WED
02/18/2026
|
Starfield, Paju | 🟢 115 | 🟠 25.8 | 🟢 30 |
|
THU
02/19/2026
|
Hapjeong Station | 🟢 106 | 🟢 48.6 | 🟢 38 |
| Hongdae Red Road | 🟢 109 | 🟢 44.4 | 🟢 29 | |
|
FRI
02/20/2026
|
Hapjeong Station | 🟢 103 | 🟢 51.2 | 🟠 40 |
| Hongdae Red Road | 🟠 91.2 | 🟢 60.6 | 🟢 39 | |
| The Hyundai Seoul | 🟢 111 | 🔴 18.3 | 🟢 32 | |
131 Mbps
60.6 Mbps
29 ms
Weekly Insight
Shopping Mall Connectivity
Q. Do local eSIM profiles maintain stable connectivity in large shopping malls?
A. Yes, Field measurements show consistently strong download performance across major retail complexes. However, upload latency may increase in certain high-density indoor zones due to structural and traffic-related factors.
Field Observation
Panoramic view of The Hyundai Seoul
We conducted real-world measurements at three major retail hubs to evaluate performance in high-density indoor environments:
Location
To evaluate indoor performance, measurements were collected at:
Environment
Tested across multiple levels, including basement floors and open central atriums.
Results
No connection drops were observed during any session. Download throughput remained above 100 Mbps across all test points, while elevated latency under upload load was recorded in select indoor zones.
Test Video
The Hyundai Seoul (1F)
The Hyundai Seoul (B1)
Test Results
| Shopping Mall | Region | Status | Speed | Responsiveness | |||
|---|---|---|---|---|---|---|---|
|
Download (Mbps) |
Upload (Mbps) |
Idle (ms) |
Download (ms) |
Upload (ms) |
|||
| The Hyundai Seoul | Yeouido, Seoul | Stable | 🟢 111 | 🔴 18.3 | 🟢 32 | 🟢 136 | 🔴 1634 |
| Mecenatpolis Mall | Hapjeong, Seoul | Stable | 🟢 109 | 🟠 44.4 | 🟢 29 | 🟢 46 | 🔴 775 |
| Starfield Village | Paju, Gyeonggi-do | Stable | 🟢 115 | 🟠 25.8 | 🟢 30 | 🟠 207 | 🔴 1270 |
Technical Note
A local carrier eSIM profile connects directly to the domestic operator’s LTE infrastructure, enabling access to indoor distributed antenna systems (DAS) commonly deployed in large commercial facilities. These systems are designed to support high-density traffic environments.
However, indoor performance may still be influenced by structural and environmental factors:
- Physical Barriers: Reinforced concrete and metallic interior materials can attenuate or reflect signals.
- Low-E Glass: Metal-coated energy-efficient glass may reduce signal penetration from outdoor sources.
- Traffic Density: High volumes of concurrent users and competing wireless systems (e.g., Wi-Fi, POS infrastructure) can increase uplink latency under load conditions.
Lab Verdict & Recommendations
Based on measurements collected during the Seollal holiday week (Feb 16–20, 2026):
Scope Note
This report reflects measurements collected during defined holiday intervals in selected urban zones. Overnight traffic conditions and extreme surge scenarios outside the monitored windows were not included in this cycle.
Stay Connected Reliably in Korea
Director of Connectivity Lab
Ian Hyukjong Yeo
"Empowering journeys with easy, reliable, and convenient traveler eSIM solutions"
Ian Hyukjong Yeo is the Director of Connectivity Lab and a telecommunications entrepreneur with over 20 years of experience in the global telecom industry. Today, he leads Connectivity Lab's research and field benchmarking initiatives evaluating real-world eSIM performance for international travelers.