Mobile network selection method and apparatus, mobile user equipment, and storage medium

A mobile network selection method, comprising:

• when a mobile user equipment supporting a Closed Access Group (CAG) function automatically selects a mobile network, determining, by a Non-Access Stratum (NAS) function of the mobile user equipment according to information in a Universal Subscriber Identity Module (USIM) of the mobile user equipment, whether to allow the mobile user equipment to access a CAG cell of a Public Land Mobile Network (PLMN);
• when the mobile user equipment receives a broadcast message of a CAG cell and the mobile user equipment is allowed to access the CAG cell of the PLMN, selecting, by the NAS function, a mobile network corresponding to a PLMN identifier indicated in the broadcast message of the CAG cell;
• and
• sending an identifier of a selectable PLMN and a corresponding CAG selection policy to an Access Stratum (AS) function of the mobile user equipment by the NAS function, wherein the CAG selection policy is used for the AS function to select a CAG cell,
• wherein sending the identifier of the selectable PLMN and the corresponding CAG selection policy to the AS function of the mobile user equipment by the NAS function comprises:
• sending third information to the AS function by the NAS function, the third comprising information of a CAG cell allowed to access.