# Start sending A2P SMS ## Common use cases Send a personalized SMS alert to a user's phone number. Send a timely reminder to a user's phone number. Send a banking transaction notification to a user's phone number. Send an OTP (One Time Password) to a user's phone number. --- # 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://developer.9bits.net/messaging/a2p-sms/start-sending-a2p-sms.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.