i funded twilio account , working in console application. when go documentation (here: https://www.twilio.com/user/account/developer-tools/api-explorer/message-create ) , enter phone number request works. however, when copy code local console application nothing happens. literally copy code line line , make sure sid, token, , numbers correct , nothing happens @ all, console app runs end of execution. string accountsid = "mysid"; string authtoken = "myauthtoken"; var twilio = new twiliorestclient(accountsid, authtoken); var message = twilio.sendsmsmessage("+12222222222", "+13333333333","hello world"); console.writeline(message.sid); i run fiddler , raw packet. fiddler says result 401 status code. post https://api.twilio.com/2010-04-01/accounts/mysid/sms/messages.json http/1.1 authorization: basic {tonsofrandomcharactersthatlooklikeishouldhide} accept: application/json, application/xml, text/json, text/x-json, text/javascript,