def message(from, to, body, callback_url=nil)
      callback = callback_url ? {:StatusCallback => callback_url} : {}
      Twilio.post("/SMS/Messages", :body => {:From => from, :To => to, :Body => body}.merge(callback))
    end
def message(from, to, body, callback_url=nil)
      callback = callback_url ? {:StatusCallback => callback_url} : {}
      Twilio.post("/SMS/Messages", :body => {:From => from, :To => to, :Body => body}.merge(callback))
    end
Example:
  Twilio.connect('my_twilio_sid', 'my_auth_token')
  Twilio::Sms.message(CALLER_ID, user_number, 'This is my simple SMS message', 'http://example.com/sms_callback')