The OTA system is a multi-function, multi-site solution for verifying SIM card/USIM card application configuration based on OTA technology.OTA system includes SIM card/USIM card, OTA server and a full set of pre-installed application and management tools.Mobile users only need to have an OTA card, perform simple operations on the phone, and can easily download various business menus provided by the network into their own SIM CARDS according to their personal preferences, and customize specific services according to their own wishes.