Apparatuses, methods, and systems are disclosed for mobility management among multiple network slices. One apparatus 300 includes a processor 305 that receives 855 an indication of an attached mobile unit attaching to a secondary network slice of the mobile communication network. The processor 305 also receives 860 a mobility management request from the mobile unit and forwards 865 the mobility management request to the secondary network slice. In various embodiments, the apparatus 300 may include a network interface 330 for communicating over a mobile communication network.