Data exceeds memory

#include <OneSheeld.h>
char* gps = "gps";
char* stopp = "stop";
float lat ;                         
float lon ;
int lock = 12;
char charlat [12];
char charlon [12];
char readings [80];
boolean flag1 = false;
boolean flag2 = false;
boolean flag3 = false;
void setup()
{
  OneSheeld.begin();
  pinMode(lock,OUTPUT);
}
void loop() {
  if(abs(AccelerometerSensor.getY()) > 1.5 )
  {
    if(!flag1)
    {
      SMS.send("01004078579","The car is moving !!");
      flag1 = true;
    }
  }
   if(!strcmp(SMS.getSms(),stopp))
  {
    if(!flag2)
    {
      digitalWrite(lock,HIGH);
      flag2 = true;
    }
  }
  if(!strcmp(SMS.getSms(),gps))
  {
    if(!flag3)
    {
      lat = GPS.getLatitude();
      lon = GPS.getLongitude();
      dtostrf(lat, 11, 7, charlat);
      dtostrf(lon, 11, 7, charlon);
      strcat(readings,"latitude is : ");
      strcat (readings,charlat);
      strcat(readings,"\nLongitude is : ");
      strcat (readings,charlon);
      SMS.send("01004078579",readings);                           
      flag3 = true;
    }                                     
  }
}