넥스프링 is a free Android application developed by 넥스프링. It is designed to remotely control a mobile router manufactured by Co. neck spring. With this app, users can easily switch off, restart, and access various information about their mobile router. The app provides details on LTE signal strength, battery life, data usage, and user information. Users can also make changes to the USIM, WiFi settings, and system management of the mobile router. Additionally, 넥스프링 offers features to set up WiFi network names, network modes, visitor limits, and security settings. Users can also configure WiFi operation settings, APN settings, USB tethering, network settings, and user/password access. Overall, 넥스프링 provides a convenient and comprehensive solution for managing and controlling mobile routers remotely.