# Advanced Options SMS API ## Priority SMS Sending - SMS Priority For time-critical SMS messages, such as authentication codes, one-time passwords, or security alerts, MessageFlow offers a dedicated channel: MessageFlow Priority. This service ensures maximum processing and sending priority within our infrastructure. Detailed information regarding MessageFlow Priority and its applications can be found in the dedicated section: [MessageFlow Priority](/advanced-features/messageflow-priority.md) --- # 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://docs.messageflow.com/sms/sms-api/advanced-options-sms-api.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.