A method for using a user equipment with first and second telecommunications networks having, or using, different network identifiers in relation to or in the framework of service enabler architecture layer for verticals, (SEAL),
- wherein the first and second telecommunications networks provide the possibility to use a first specific network slice of the first telecommunications network and a second specific network slice of the second telecommunications network, via a network slice capability enablement server (NSCE) server, to a vertical application layer server (VAL server), and wherein the user equipment is a vertical application layer user equipment comprising a vertical application layer client (VAL client) and a network slice capability enablement client (NSCE client),
- wherein the user equipment has a native subscription to the first telecommunications network but lacks a native subscription to the second telecommunications network,
- wherein, in order to realize service continuity even in case that the user equipment is connected via the second telecommunications network only, the method comprises the following steps:
- in a first step, the VAL server transmits a message to the NSCE server, thereby requesting an application service continuity requirement request;
- and
- in a second step, the NSCE server interacts with the first telecommunications network, the second telecommunications network, and the user equipment in view of realizing application service continuity to the user equipment.