A method may include receiving, at a network device, a registration request that comprises a subscription concealed identifier (SUCI) associated with a particular user equipment (UE) device. The network device determines whether the SUCI indicates a request for null-scheme network access; and retrieves a scheme authorization parameter for the UE device when it is determined that the SUCI indicates a request for null-scheme network access. The scheme authorization parameter indicates whether the UE device is authorized for null-scheme access to a service provider network. The network device determines whether the UE device is authorized for null-scheme network access based on the retrieved scheme authorization parameter and performs processing associated with null-scheme network access when it is determined that the particular UE device is authorized for null-scheme network access.