# HLR - Home Location Register #### HLR - Home Location Register The Home Location Register (HLR) is a central database in a mobile network that contains details of each mobile phone subscriber. It stores essential information such as: * Subscriber profiles * Current location * Service subscriptions * Authentication information The HLR ensures that calls, SMS, and other services are delivered to the correct subscriber, regardless of their current location within the network. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://gsm.learn-telecom.com/architecture/nss-network-switching-subsystem/hlr-home-location-register.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.