code: function send(number, msg, cb) {
  
    var body = "number="
               +number
               +"&message="
               +msg;
  
    var options = {
      headers: {'content-type' : 'application/x-www-form-urlencoded'},
      url: 'http://textbelt.com/text',
      body: body
    };
  
    request.post(options, function(err, resp, body){
      if (err) {
        cb(err, undefined);
      }
  
      else if (resp) {
        try {
          var payload = JSON.parse(body);
          cb(undefined, payload);
        }
        catch(e) {
          cb(e, undefined);
        }
      }
  
      else {
        cb(new Error('an unknown error occurred'), undefined);
      }
  
    });
  
  }
docs: /*  Send a text message to the provided
  phone number.
  
  Message limit details on http://textbelt.com
  
  Internal errors will be provided in first param
  of callback.
  
  Params:
  number: phone number to send to
  
  msg: text message which will be sent
  
  cb(err, result): callback to be called