获取sim卡的唯一标识--imsi号

现在，手机号码大部分都不存在sim卡上了，所以有的sim卡是取不到手机号的，但是，可以取到一个imsi号，这个号是一个15位的数字，可以跟据这个号来做移动开发的身份验证，取法如下： 

        //获取sim卡的imsi号，做为该用户的唯一标识
        public string getMobileImsi()
        {
            string result = "";
            try
            {
                Tapi t = new Tapi();
                t.Initialize();
                Line l = t.CreateLine(0, LINEMEDIAMODE.INTERACTIVEVOICE, OpenNETCF.Tapi.LINECALLPRIVILEGE.MONITOR);
                ControlTapi ctapi = new ControlTapi();
                GeneralInfo gi = ctapi.GetGeneralInfo(l);

                result = gi.SubscriberNumber;
                l.Dispose();
                t.Shutdown();

            }
            catch// (Exception ex)
            {
                result = "";
            }
            //返回sim卡的imsi
            return result;
        }
        public class ControlTapi
        {

            [DllImport("cellcore.dll")]
            private static extern int lineGetGeneralInfo(IntPtr hLigne, byte[] lpLineGeneralInfo);

            /// <summary>
            /// 调用cellcore.dll获取sim卡的综合信息
            /// </summary>
            /// <param name="l"></param>
            /// <returns></returns>
            public GeneralInfo GetGeneralInfo(Line l)
            {
                GeneralInfo lgi = new GeneralInfo();
                byte[] buffer = new byte[512];
                BitConverter.GetBytes(512).CopyTo(buffer, 0);

                if (lineGetGeneralInfo(l.hLine, buffer) != 0)
                {
                    throw new System.ComponentModel.Win32Exception(System.Runtime.InteropServices.Marshal.GetLastWin32Error(), "TAPI Error: " + System.Runtime.InteropServices.Marshal.GetLastWin32Error().ToString("X"));
                }

                int subscsize = BitConverter.ToInt32(buffer, 44);
                int subscoffset = BitConverter.ToInt32(buffer, 48);
                lgi.SubscriberNumber = System.Text.Encoding.Unicode.GetString(buffer, subscoffset, subscsize).ToString();
                lgi.SubscriberNumber = lgi.SubscriberNumber.Replace("/0", "");
                return lgi;

            }
        }
        public struct GeneralInfo
        {
            public string Manufacturer;
            public string Model;
            public string Revision;
            public string SerialNumber;
            public string SubscriberNumber;
        }

注意：其中用到一个TapiLib.dll包，大家可以去网上找一下，下载下来，由于这里不能上传附件（我没有找到），见谅！