Roambit
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Roambit's key selling point is the ability to stay connected on your original phone number while using their embedded SIM for data, so incoming calls and texts still reach you without setting up call forwarding. The no-throttle unlimited data option for 15 days at $45.60 targets travelers who won't sacrifice speed for anything. They cover 200+ destinations including Korea's full network, making it a true global eSIM.
This setup appeals to business travelers or digital nomads who need simultaneous access to both their home number and fast internet abroad. Since your original number stays active, clients and family can reach you directly. The 15-day window is longer than many Korean specialists' 7-day or 4-day plans, so it works well for month-long trips where you can top up once and stay covered.