Received SMS using AT Command

string recievedData = ExecCommand(port, "AT", 300, "No phone connected at ");
recievedData = ExecCommand(port, "AT+CMGF=1", 300, "Failed to set message format.");
String command = "AT+CPMS?";
recievedData = ExecCommand(port, command, 1000, "Failed to count SMS message");
int uReceivedDataLength = recievedData.Length;

#endregion
//We received uReceivedDataLength 34 that false the condition
#region If command is executed successfully
if ((recievedData.Length >= 45) && (recievedData.StartsWith("AT+CPMS?")))
{

    #region Parsing SMS
    string[] strSplit = recievedData.Split(',');
    string strMessageStorageArea1 = strSplit[0];     //SM
    string strMessageExist1 = strSplit[1];           //Msgs exist in SM
    #endregion

    #region Count Total Number of SMS In SIM
    CountTotalMessages = Convert.ToInt32(strMessageExist1);
    #endregion

}