example.js

var accountSid = '{{ YOUR_ACCOUNT_SID }}';
var authToken = '{{ YOUR_AUTH_TOKEN }}';
var LookupsClient = require('twilio').LookupsClient;
var client = new LookupsClient(accountSid, authToken);
var phoneNumber = process.argv[2];

client.phoneNumbers(phoneNumber).get({
  type: 'carrier'
}, (error, number) => {
  var message = number ? number.national_format + ' is valid' : error;
  if (error && error.status === 404) message = 'Invalid phone number';
  console.log(message);
});