# MS - Mobile Station **MS - Mobile Station** A Mobile Station (MS) refers to a wireless device used for communication in cellular networks. It comprises both the mobile equipment (ME), such as a smartphone, and the subscriber identity module (SIM), which stores user-related information and authentication data. The MS allows users to make calls, send texts, and access mobile data services. --- # 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/ms-mobile-station.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.