A method for transmitting information performed by a terminal is disclosed. The method includes: acquiring a first network identifier of a detected wireless communication network; sending a SIM card information request to a server, the SIM card information request including at least the first network identifier; receiving identity information and encryption data of a first SIM card sent by the server, the first SIM card corresponding to the detected wireless communication network corresponding to the first network identifier included in the SIM card information request; and joining the detected wireless communication network corresponding to the first network identifier using the identity information and encryption data of the first SIM card, and transmitting information through the detected wireless communication network.