static void Main(string[] args) { // Find your Account Sid and Auth Token at twilio.com/user/account string AccountSid = "ACXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX"; string AuthToken = "your_auth_token"; var twilio = new TwilioRestClient(AccountSid, AuthToken); var shortCodes = twilio.ListShortCodes(null, null); foreach (var shortCode in shortCodes.ShortCodes) { Console.WriteLine(shortCode.ShortCode); } }