Twilio SendMessage c#

似乎没有收到任何短信发送回来，帐户是在试用模式，但我把我的号码添加到验证号码，有什么想法吗?

   [HttpGet]
    public ActionResult SmsRequest(FormCollection form)
    {   
    var model = new Models.SMSRequest();
    model.From = form["From"];
    //more code
    string AccountSid = "GUID";
    string AuthToken = "GUID";
    var client = new TwilioRestClient(AccountSid, AuthToken);
    //0000 = twilio assigned number
    var result = client.SendMessage("00000", model.From, "Thank you for your SMS");
    }