Product info
Busan eSIM plans
| Unlimited data · 5 days | $17.99 | Buy eSIM |
| Ohayu recommendsUnlimited data · 10 days | $31.99 | Buy eSIM |
| Unlimited data · 15 days | $41.99 | Buy eSIM |
| Unlimited data · 30 days | $58.99 | Buy eSIM |
| 3GB prepaid eSIM · 14 days | $8.49$2.83 / GB | Buy eSIM |
| 5GB prepaid eSIM · 30 days | $10.49$2.10 / GB | Buy eSIM |
| 10GB prepaid eSIM · 30 days | $18.49$1.85 / GB | Buy eSIM |
| 15GB prepaid eSIM · 60 days | $23.99$1.60 / GB | Buy eSIM |
| 20GB prepaid eSIM · 30 days | $29.49$1.47 / GB | Buy eSIM |
| 50GB prepaid eSIM · 30 days | $66.79$1.34 / GB | Buy eSIM |
You can install your eSIM before the trip and activate it when you arrive in South Korea. Validity starts after eSIM activation.
Plan details
How much mobile data you need
What's the best eSIM for Busan?
A few days – 3 GB
Maps, beaches, markets.
Korea for a week – 10 GB
Busan, Gyeongju, Seoul by KTX.
Korea plus Japan – 20 GB
Two plans for the ferry route.
Working from Busan – Unlimited
Tethering on a 200 Mbps network.
Coverage and network
Coverage across the port city
South Korea mobile networks
South Korea ranks 7th worldwide at about 241 Mbps and Busan measures around 203. Korean coverage is close to total - subways, tunnels, mountains, islands - and the country was among the first to run nationwide 5G. There is very little to warn you about.
Speedtest Global Index · Mobile · Busan · June 2026
Download
203.37 Mbps
Upload
24.42 Mbps
Latency
27 ms
Global rank
#37 of 98
Busan, specifically
- Haeundae, Gwangalli, Nampo-dong: Very fast 5G everywhere. The beachfronts and the markets are all well covered.
- The subway and the tunnels: Fully covered, including the long tunnels through the hills that split the city. Korea equips its underground as a matter of course.
- Gamcheon and the hillside villages: Covered. The painted houses climb steeply and the alleys are tight, but signal holds better than the geometry suggests.
- The ferry to Fukuoka: Coverage fades as you leave the harbour. A Korean plan does not cover Japan - the jetfoil takes under four hours and this is a common crossing, so plan the onward data before you sail.
- Beomeosa and the mountain temples: The temple grounds and the trails behind them on Geumjeongsan are covered further up than you would expect.
South Korea, not Japan
The plan covers all of South Korea - Busan, Seoul, Jeju. Fukuoka is a ferry ride away and Japan needs its own plan.
How to install eSIM
Connected in 3 steps
- 01
Buy before you fly
Choose your data plan before your trip.
- 02
Download & install
Log in to your account, tap your eSIM, and follow the on-screen instructions.
- 03
Land & activate
Activate when you arrive in South Korea. Turn on roaming for the eSIM and it connects to a local network.
Before you buy, make sure your phone supports eSIM — see Ohayu compatible devices list or dial *#06#. It's a free request to your phone's settings. If you see the EID number — your phone is eSIM-compatible.
Arriving in Busan
Gimhae airport and the port
Gimhae has free terminal Wi-Fi and connects to the city by light rail and subway. Korea has extensive free public Wi-Fi generally, though signing on to it usually expects a Korean phone number - which is where a visitor comes unstuck.
Side by side
Busan eSIM Comparison
Indicative comparison based on publicly listed South Korea plans as of August 2026. Competitor pricing and policies change - check their sites for current terms.
Frequently asked questions
Why not just use Korea's free public Wi-Fi?
Because signing on to a lot of it expects a Korean phone number for verification, which a visitor does not have. The coverage is genuinely widespread - subway trains, buses, cafés - but the authentication step is the wall. Having your own data avoids the loop entirely.
Where to buy a SIM card in Busan?
Counters at Gimhae and shops in Nampo-dong and Seomyeon. Korea requires identity registration for a local line, and tourist SIMs are sold as fixed-term products. Korean prepaid is not especially cheap.
Does the plan work on the ferry to Japan?
Only near the Korean coast. Japan is a separate destination, so the Fukuoka crossing takes you out of this plan - and it is a popular route, under four hours by jetfoil. Buy the Japanese plan before you sail if you want to arrive connected.
eSIM not working in Busan?
Korea is one of the least likely places for a genuine coverage gap. Check the Ohayu eSIM is your mobile data line with roaming enabled, then toggle Airplane mode. Chat and support@ohayu.com are open 24/7.
