A method and apparatus for providing connectivity with a public communication services network (204) for a mobile terminal (200). A temporary connectivity identity and associated security parameters are obtained from the network (2:1) and loaded into the mobile terminal from a connectivity providing unit (202) over a local communication link (2:2). When the mobile terminal (2:3) later sends an access request to the network including the temporary connectivity identity, the mobile terminal is registered with the network based on the temporary connectivity identity and associated security parameters. If the network can validate the temporary connectivity identity by means of the associated security parameters (2:5), a connection can be set up with the mobile terminal (2:6) for communication services in the network.