Systems and methods are described herein for enabling service continuity between standalone non-public network (SNPN) and a public land mobile network (PLMN). A wireless transmit/receive unit (WTRU) may enable service continuity, for example, by triggering a temporary leave of the WTRU from a serving SNPN to prepare a pre-established backup user plane (UP) connection in a PLMN. A network may enable service continuity, for example, by triggering a temporary leave of a WTRU from a serving SNPN to prepare a pre-established backup UP connection in a PLMN. A WTRU may switch back to SNPN from PLMN, for example, using an SNPN priority search mode and/or other WTRU behavior(s).