User devices configured to select subsets of network identities and network devices configured to deliver messages based on those subsets are described herein. The user devices each receive multiple network identities for a service account, select a subset of the network identities based on preferences, and provide the selected subset to the telecommunication network in message headers. The preferences indicate network identities for which a user wishes the user device to receive communications. A network device receives and caches the subsets. The network device further utilizes the subsets in determining which user device to deliver messages to.