Code
public struct GeneralInfo
    {
        public string Manufacturer;
        public string Model;
        public string Revision;
        public string SerialNumber;
        public string SubscriberNumber;
    }
 
    /// <summary>
    /// Tapi控制类
    /// </summary>
    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>
        private  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;
 
        }
 
       
 
        /// <summary>
        /// 获取sim卡的IMSI
        /// </summary>
        /// <returns></returns>
        public static string  GetIMSINumber()
        {
            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 = "";
            }
 
            return result;
 
        }
 
        /// <summary>
        /// 获取IMEI的号码
        /// </summary>
        /// <returns></returns>
        public static string GetIMEINumber()
        {
            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.SerialNumber;
                l.Dispose();
                t.Shutdown();
 
            }
            catch// (Exception ex)
            {
                result = "";
            }
 
            return result;
        }

    }