NX MOBILE is the travel eSIM brand of Vision Factory LLC (United States), selling prepaid eSIMs for South Korea in USD. All plans run on SK Telecom's network in Korea and are delivered by email as a QR code within minutes of purchase, together with an English setup guide. The plan period starts when the eSIM first connects to a network in Korea, not when it is installed, so travellers can set it up before they fly. Unused eSIMs can be cancelled for a full refund before installation or activation, and support is handled by email in English with a reply within one business day.