TravelPass lets you use your Verizon Wireless domestic talk, text and data in more than 130 destinations, including South Korea, for a low daily rate. ($10/day in South Korea.) It's a convenient option for international travel.
4G data speeds apply for the first 512 MB/day with 2G speeds thereafter. If more than 50% of your talk, text or data usage in a 60-day period is in Canada or Mexico, use of those services in those countries may be removed or limited.