A network access method includes the follows. Information of a target user identification card inserted into a mobile terminal is detected. Whether the target user identification card is included in at least one user identification card stored in advance by the mobile terminal is determined. If no, determine that the target user identification card is a new card inserted into the mobile terminal the first time and all the network types supported by the target user identification card according to a type of the target user identification card will be determined. Network identifiers of PLMNs of all the network types are determined and added to an EHPLMN list. If it finds a target PLMN that matches a network identifier in the EHPLMN list when the mobile terminal arrives at a place of visit from a designated location, a communication connection between the mobile terminal and the target PLMN is established.