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 options = new DomainOptions(); options.FriendlyName = "Little Kevin"; options.VoiceMethod = "GET"; twilio.UpdateDomain("SD32a3c49700934481addd5ce1659f04d2", options); }