A WTRU (102) may receive updated assistance information for network slice selection and/or reselection (410). The WTRU may apply local policies to determine when to use the updated assistance information to access a network slice (440). The WTRU may determine whether to contact an existing network slice function (470) or a new network slice function (460) to establish a connection to a network slice. Based on the determination, the WTRU may transmit different information to the network. The network slice selection and/or reselection may be initiated by a WTRU or by a network.