public class RetrieveSimPhoneBook
    {
        public RetrieveSimPhoneBook() { }

        private const Int64 S_OK = 0x00000000;
        public const int SIM_CAPSTYPE_ALL = 0x3F; //
        public const int SIM_PBSTORAGE_SIM = 0x10; //
        public const int SIM_SMSSTORAGE_SIM = 0x2; //

        [StructLayout(LayoutKind.Sequential)]
        public struct SIMPHONEBOOKENTRY
        {
            public uint cbSize; //
            public uint dwParams; //
            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 256)]
            public string lpszAddress; //
            public uint dwAddressType; //
            public uint dwNumPlan; //
            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 256)]
            public string lpszText; //
        }

        [DllImport("cellcore.dll")]
        public static extern int SimInitialize(uint dwFlags,
        int lpfnCallBack, uint dwParam, ref int lphSim);
        [DllImport("cellcore.dll", SetLastError = true)]
        public static extern int SimDeinitialize(int hSim);
        [DllImport("cellcore.dll")]
        public static extern int SimGetPhonebookStatus(int hSim,
        uint dwLocation, ref uint lpdwUsed, ref uint lpdwTotal);
        [DllImport("cellcore.dll")]
        public static extern int SimReadPhonebookEntry(int hSim, uint dwLocation, uint dwIndex, ref  SIMPHONEBOOKENTRY entry);
       

        public static List<string[]> GetSIMContactList()
        {
            int hSim = 0;
            List<string[]> list = new List<string[]>();
            try
            {
                int res = SimInitialize(0, 0, 0, ref hSim);
                if (res != 0)
                    throw new Exception("Exception Contacts in the SIM Card");
                uint mynumber = 0;
                uint totNumber= 0;
                result = SimGetPhonebookStatus(hSim, SIM_PBSTORAGE_SIM, ref mynumber , ref totNumber);
                for (int i = 1; i <= mynumber ; i++)
                {
                    SIMPHONEBOOKENTRY entry = new SIMPHONEBOOKENTRY();
                    entry.cbSize = (uint)Marshal.SizeOf(typeof(SIMPHONEBOOKENTRY));
                    res = SimReadPhonebookEntry(hSim, SIM_PBSTORAGE_SIM, (uint)i, ref entry);
                    list.Add(new string[2] { entry.lpszText.Trim(), entry.lpszAddress.Trim() });
                }
                return list;
            }
            catch
            {
                throw;
            }
            finally
            {
                SimDeinitialize(hSim);
            }
        }
    }