GSM setup() does not run correctly... :(

what goes wrong?

//librarys
#include <GSM.h> //GSM
#include <OneWire.h> //Sensor
#include <DallasTemperature.h> //Sensor
#include <EEPROM.h> //Offline SAVE

////Telefoon
#define PINNUMBER "0000"

GSM gsmAccess;
GSM_SMS sms;

// Temperature
#define ONE_WIRE_BUS 4
OneWire oneWire(ONE_WIRE_BUS);
// Pass our oneWire reference to Dallas Temperature.
DallasTemperature sensors(&oneWire);
// Hardware adres DS18B20 PIN 4
DeviceAddress Thermometer = { 0x28, 0xBF, 0x64, 0xA3, 0x06, 0x00, 0x00, 0xC3 };

//Variable
int AlarmOn = 1; //=1 AAN =0 OFF
int Sensor = 0; //=0 IS FOUT
int InkomendeSMS = 0;

float TEMPAlarm = 10.00; //TEMP ALARM
float tempC ;
float voltage ;

char Naam[17] = "Nacht1 Online"; //MAX 10 karakters

////Telefoonnummers Beheerders
char TelB1[14] = "+31600000000";

////Telefoonnummers Leden
char NrSMSOntvangen[14];

//Global files
byte  ALARM_FLAG = 0;

String textStatusSMS;
String textOnlineSMS;
String ALARMStatus;
String voltageMelding;
String message1;
String message2;
String SensorStatus;
String NRSENDSMS;

//SETUP
void setup(void) 
{

  // start serial port
  Serial.begin(9600); 
  Serial.println("<> Aan");

  analogReference(INTERNAL);

  // SIMmodule
  // Connection state
  boolean notConnected = true;
  Serial.println("Offline");

  // Start GSM shield
  while(notConnected){
  if(gsmAccess.begin(PINNUMBER)==GSM_READY)
      notConnected = false;  
      else{
      Serial.println("Offline wacht op nieuwe poging");
      delay(1000);
    }
  }
  // Start library
  sensors.begin();
  // set the resolution to 10 bit (good enough?)
  sensors.setResolution(Thermometer, 10);
  Serial.print("TEMP Online");
  
  //SMS Online
  Serial.print("Online SMS ");
  sendSMSOnline();
}



//LOOP
void loop(void)
{
  int sensorValue = analogRead(A0);
  voltage = sensorValue * (12 / 1023.0);
  Serial.print(voltage);
  Serial.println("\n");

  if (voltage < 6.75 ) {
    ALARM_FLAG = 1;
  }

  Serial.print("Meten...\n\r");
  sensors.requestTemperatures();

  Serial.print("Temperature ");
  TempControl(Thermometer);
  Serial.print("\n\r");

  //Check
  SMSOntvangen();

  if ( AlarmOn == 1 ) {

    if ( ALARM_FLAG == 1 ) {
      Serial.println("Alarm geactiveerd");
      InkomendeSMS = 0;
      SMSALARM();
    }
  }
  delay (100);
}


// Temperatuur sensor
void TempControl(DeviceAddress deviceAddress) {

  tempC = sensors.getTempC(deviceAddress);
  Serial.println(tempC);

  // float tempC = sensors.getTempC(deviceAddress);
  Serial.println(tempC);
  Sensor = 0;

  if (tempC < -100.00) {
    Serial.print("Sensor is niet verbonden");
    ALARM_FLAG = 1;
  }
  else if (tempC <= (float) TEMPAlarm) {
    Serial.print("C: ");
    Serial.print(tempC);
    ALARM_FLAG = 1;
    Sensor = 1;
    SMSALARM();
  }
  else {
    Serial.print("> ingestelde waarde, het is nu *C ");
    Serial.print(tempC);
    Sensor = 1;
  }
}
//SMS Ontvangen
void SMSOntvangen() {

  char c;
  if (sms.available()) {

    // Get remote number
    sms.remoteNumber(NrSMSOntvangen, 14);
    Serial.println(NrSMSOntvangen);
    if (sms.peek() == '#') {
      Serial.println("Discarded SMS");
      sms.flush();
    }

    // Read message bytes and print them
    while (c = sms.read()) {
      if (c == '1') {
        Serial.println("SMS ONTVANGEN 1");
        AlarmOn = 0;
        InkomendeSMS = 1;
        SMSALARM();
      }
      else if (c == '2') {
        Serial.println("SMS ONTVANGEN 2");
        AlarmOn = 1;
        InkomendeSMS = 1;
        SMSALARM();
      }
      else if (c == '3') {
        Serial.println("SMS ONTVANGEN 3");
        InkomendeSMS = 1;
        SMSALARM();
      }
      else {
        Serial.println("FOUT COMMANDO!");
      }
    }
    sms.flush();
    Serial.println("Verwijder bericht");
  }
}


void sendSMSOnline() {

  Serial.print("SMS");
  Serial.println(TelB1);

  textOnlineSMS.concat(Naam);
  textStatusSMS.concat ( "\n");
  textStatusSMS.concat("Meld status Online");

  Serial.println(textOnlineSMS);
  // send the message
  sms.beginSMS(TelB1);
  sms.print(textOnlineSMS);
  sms.endSMS();
  Serial.println("\nCOMPLETE!\n");
}


void SMSALARM() {

  Serial.print("\n\n Nummer:");
  Serial.println(TelB1);

  if (InkomendeSMS == 1)
  {
    NRSENDSMS = (NrSMSOntvangen);
  }
  else {
    NRSENDSMS = (TelB1);
  }

  if (ALARM_FLAG >= 1) {
    message1 = "ALARM";
    message2 = " ALERT";
  }
  else if (ALARM_FLAG == 0) {
    message1 = "STATUS";
    message2 = " REPORT";
  }

  if (AlarmOn == 1 ) {
    ALARMStatus = " AAN";
  }
  else {
    ALARMStatus = " UIT";
  }

  if (Sensor == 1 ) {
    SensorStatus = " OK";
  }
  else {
    SensorStatus = " FOUT!";
  }

  if (voltage > 6.75 ) {
    voltageMelding = " OK";
  }
  else if (voltage > 6.00 ) {
    voltageMelding = " Gevaarlijk laag!";
  }
  else {
    voltageMelding = " ALARM, ONLINE STATUS IN GEVAAR!";
  }

  textStatusSMS.concat(Naam) + "\n";
  textStatusSMS.concat("------ \n");
  textStatusSMS = message1  +  message2  + "\n";
  textStatusSMS.concat("------ \n");

  textStatusSMS.concat("Temperatuur ");
  textStatusSMS.concat((float)tempC);
  textStatusSMS.concat(" *C \n\n");

  textStatusSMS.concat("Huidige instellingen:  \n");
  textStatusSMS.concat("------ \n");

  textStatusSMS.concat ("Alarm:");
  textStatusSMS.concat (ALARMStatus) + " \n";
  textStatusSMS.concat("Alarm temperatuur: ");
  textStatusSMS.concat((float)TEMPAlarm);
  textStatusSMS.concat(" *C\n");
  textStatusSMS.concat("Voltage: ");
  textStatusSMS.concat(voltage) + " V";
  textStatusSMS.concat(voltageMelding) + " \n";

  textStatusSMS.concat ("Sensor:");
  textStatusSMS.concat (SensorStatus);

  delay (100);

  // sms text
  Serial.println("SENDING");
  Serial.println();
  Serial.println("Message:");
  Serial.println(textStatusSMS);

  // send the message
  sms.beginSMS(NrSMSOntvangen);
  sms.print(textStatusSMS);
  sms.endSMS();
  Serial.println("\nCOMPLETE!\n");

  ALARM_FLAG = 0;
  InkomendeSMS = 0;
}

VVVVVVVVVV

In file included from /Applications/Arduino.app/Contents/Java/libraries/GSM/src/GSM.h:46:0,
from /Users/Maikel/Documents/Arduino/Temp6/Temp6.ino:2:
/Applications/Arduino.app/Contents/Java/libraries/GSM/src/GSM3ShieldV1BandManagement.h:49:125: warning: ‘typedef’ was ignored in this declaration [enabled by default]
typedef enum GSM3GSMBand {UNDEFINED, EGSM_MODE, DCS_MODE, PCS_MODE, EGSM_DCS_MODE, GSM850_PCS_MODE, GSM850_EGSM_DCS_PCS_MODE};
^
/Users/Maikel/Documents/Arduino/Temp6/Temp6.ino: In function ‘void setup()’:
/Users/Maikel/Documents/Arduino/Temp6/Temp6.ino:67:31: warning: deprecated conversion from string constant to ‘char*’ [-Wwrite-strings]
if(gsmAccess.begin(PINNUMBER)==GSM_READY)
^

Sketch uses 24,604 bytes (76%) of program storage space. Maximum is 32,256 bytes.
Global variables use 1,553 bytes (75%) of dynamic memory, leaving 495 bytes for local variables. Maximum is 2,048 bytes.
Low memory available, stability problems may occur.

What is the problem? The first two messages are warnings only. They do not affect the resulting file that is uploaded.

The last message is telling you that your overuse of String is possibly going to cause problems.