send sms with more than 160 characters

Question

I'm developing SMS system using C#.  I use GSMCOMM
how to send sms with more than 160 characters and enable the customer to receive cut SMS as ONE SMS
My code is
  public ShortMessageCollection ParseMessages(string input)
        {
            var r = new Regex(@"\+CMGL: (\d+),""(.+)"",""(.+)"",(.*),""(.+)""",
                  RegexOptions.Compiled);
            var messages = new ShortMessageCollection();
            using (var sw = new StringReader(input))
            {
                string currentLine = sw.ReadLine();
                while (currentLine != null)
                {
                    var m = r.Match(currentLine);
                    if (m.Success)
                    {
                        // read the first line of the message
                        string message = string.Empty;
                        currentLine = sw.ReadLine();

                        // Append any extra lines to our message, unless it's a new record
                        while (currentLine != null && !r.IsMatch(currentLine))
                        {
                           message += Environment.NewLine;
                            message += currentLine;

                            currentLine = sw.ReadLine();
                        }

                        messages.Add(new ShortMessage
                        {
                            Index = m.Groups[1].Value,
                            Status = m.Groups[2].Value,
                            Sender = m.Groups[3].Value,
                            Alphabet = m.Groups[4].Value,
                            Sent = m.Groups[5].Value,
                            Message = message,
                        });
                    }
                    else
                    {
                        // TODO: Log that a line didn't match
                        // it could be empty or otherwise invalid
                        currentLine = sw.ReadLine();
                    }
                }
            }
            return messages;
}