Abstract: A method and apparatus for sending subscriber identifiers are disclosed. The method includes: receiving information of a USIM card from a UICC in a cloud card pool over a first communication connection; receiving an identity request from a 5G SA network, wherein the identity request is for requesting acquiring a SUCI; acquiring the SUCI based on the identity request and the information of the USIM card; and sending the SUCI to the 5G SA network, wherein the SUCI is for establishing a second communication connection. The SUCI may be generated at the ME or at the UICC. The first communication connection may be a roaming communication connection and the second communication connection may be a non-roaming communication connection.