At operation 5, when the UE 200 successfully receives data at operation 4C, the UE 200 may disconnect a configuration PDU session of the onboarding network and perform deregistration.

At operation 6, the UE 200 may be registered in the serving network by using the received user subscription data to receive a network service. The onboarding network and the serving network may be the same as or different from each other.

FIG. 4 illustrates a procedure for discovering and selecting an SNPN network for onboarding of a UE when a plurality of onboarding SNPN networks exist according to an embodiment of the disclosure.

Referring to FIG. 4, at operation 1, a UE 200 may pre-configure a default UE credential and a unique UE ID assigned from a DCS 600. The UE 200 may include the following initial default configuration; a PLMN ID, an NIF of the SNPN, an S-NSSAI, a DNN, etc.

In this case, the default UE credential may be configured by the UE 200, but the network credential may not be configured and may be provided to the UE 200 as a for the onboarding procedure.