From Facebook Developer Wiki
Description
This method sends a given text message (SMS) to the user. Does NOT require an active session, can be sent asynchronously.
Parameters
| Required | Name | Type | Description |
| required | api_key | string | The application key associated with the calling application. If you specify the API key in your client, you don't need to pass it with every call. |
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| call_id | float | The request's sequence number. Each successive call for any session must use a sequence number greater than the last. We suggest using the current time in milliseconds, such as PHP's microtime(true) function. If you specify the call ID in your client, you don't need to pass it with every call. |
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| sig | string | An MD5 hash of the current request and your secret key, as described in the How Facebook Authenticates Your Application. Facebook computes the signature for you automatically. |
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| v | string | This must be set to 1.0 to use this version of the API. If you specify the version in your client, you don't need to pass it with every call. |
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| session_key | string | The session key of the user who may have added the application. |
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| optional | format | string | The desired response format, which can be either XML or JSON. (Default value is XML.) |
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| callback | string | Name of a function to call. This is primarily to enable cross-domain JavaScript requests using the <script> tag, also known as JSONP, and works with both the XML and JSON formats. The function will be called with the response passed as the parameter. |
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| uid | uid | The user ID of the user who may have enabled SMS for the application. If this parameter is not specified, then it defaults to the session user. |
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| message | string | The content of the text message to send. |
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| session_id | int | The session ID that identifies whether the application is responding to a user generated message. |
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| req_session | bool | Indicates whether to request a session if the application has an expectation that a user may reply to this SMS directly. In this case a session id is generated and passed back to the application for its book keeping. If a session id is not requested, the message is sent to the user through a generic number and any replies to that message will be forwarded along with no guarantee of corresponding to a specific outbound message. |
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Response
This method returns 0 on success and req_session is false, or the session_id that was created.
Error Codes
| Code | Description |
| 1 | Unknown exception. |
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| 270 | Permissions disallow SMS to the user. |
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| 850 | Invalid session_id expired session (response message). |
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| 851 | Invalid SMS length. |
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| 852 | User has met the quota (unsolicited message). |
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| 854 | Over application daily SMS quota/rate limit. |
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| 855 | User is not registered for Facebook Mobile Texts. |
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| 856 | User has SMS notifications turned off. |
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| 857 | SMS application disallowed by mobile operator. |
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See Also
