get long sms

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Hello. I have some problems with getting sms. I get messages in DOS encoding, 
like:

0065004800680034004A0054004E0043004E005400410075004E005400410033004E006A0067006C
004D00300049007

A004D004300340031004F00540051007A004D0

it's not a problem to decode it using table:
http://www.tachyonsoft.com/cp00866.htm

BUT i can't read all sms, it's println only first 133 bytes. but i know that it 
must be more. I use code from example:

    #include "SIM900.h"
    #include <SoftwareSerial.h>
    //If not used, is better to exclude the HTTP library,
    //for RAM saving.
    //If your sketch reboots itself proprably you have finished,
    //your memory available.
    //#include "inetGSM.h"

    //If you want to use the Arduino functions to manage SMS, uncomment the lines below.
    #include "sms.h"
    SMSGSM sms;

    //To change pins for Software Serial, use the two lines in GSM.cpp.

    //GSM Shield for Arduino
    //www.open-electronics.org
    //this code is based on the example of Arduino Labs.

    //Simple sketch to send and receive SMS.

    int numdata;
    boolean started=false;
    char smsbuffer[500];
    char n[20];

    void setup()
    {
      //Serial connection.
      Serial.begin(9600);
      Serial.println("GSM Shield testing.");
      //Start configuration of shield with baudrate.
      //For http uses is raccomanded to use 4800 or slower.
      if (gsm.begin(2400)){
        Serial.println("\nstatus=READY");
        started=true; 
      }
      else Serial.println("\nstatus=IDLE");

      if(started){
        //Enable this two lines if you want to send an SMS.
        //if (sms.SendSMS("3471234567", "Arduino SMS"))
          //Serial.println("\nSMS sent OK");
      }

    };

    void loop()
    {
      if(started){
        //Read if there are messages on SIM card and print them.
        if(gsm.readSMS(smsbuffer, 500, n, 20))
        {
          Serial.println(n);
          Serial.println(smsbuffer);
        }
        delay(1000);
      }
    };

Original issue reported on code.google.com by chiffa...@gmail.com on 7 May 2014 at 7:43