API method to use: send_text_message
Send a text message (SMS) to a mobile number.
Send a text message (SMS) to a mobile number. We send the text message immediately; delivery is usually within a few seconds.
You may send a text message longer than the maximum SMS length of 160 characters if required - the charge is applied for each block of 160 characters in the message.
You may also send messages contaning characters outside of the range 0-127; the system will send as Unicode if needed.