| Parameter | Details | 
|---|---|
| to (str) | The destination phone number. | 
| from_ (str) | The phone number sending this message (must be a verified Twilio number) | 
| body (str) | The message you want to send, limited to 160 characters. | 
| status_callback | A URL that Twilio will POST to when your message is processed. | 
| application_sid (str) | The 34 character sid of the application Twilio should use to handle this phone call. | 
Twilio will send SMS messages for long codes (in the US, a regular ten digit number) at a rate of one message per second. For additional throughput, you can use pools of numbers with Copilot or apply for a shortcode, which can send 30 messages or more per second.