SMS

Send SMS and MMS messages, one at a time or up to 1000 in a single request.

Each message in a request is validated on its own. Valid messages are queued and returned in data.messages; any that fail come back in data.errors with an error_code and an error_help explaining the fix, so one bad number doesn't block the rest of a batch.

Messages can be scheduled with date, tagged with a campaign or reference for reporting, and carry up to 10 metadata key/value pairs that are returned with delivery receipts and replies. Every message is checked against an opt-out list before it is sent.

Use the dry-run endpoint to validate a request and see parts and cost without sending. See Sending messages for MMS rules, error codes and testing numbers.