SendSMS

HTTP Method Used: POST

Send a new outgoing message. View Twilio Docs

format  
From A Twilio number enabled for SMS. Only phone numbers purchased from Twilio work here; you cannot (for example) spoof SMS messages from your own cell phone number.
To The number to call. Format with a '+' and country code e.g., +16175551212 (E.164 format). Twilio will also accept unformatted US numbers e.g., (415) 555-1212, 415-555-1212.
Body The text of the message you want to send, limited to 160 characters.
StatusCallback A URL that Twilio will POST to when your message is processed. Twilio will POST the SmsSid as well as SmsStatus=sent or SmsStatus=failed.