intenta así:
Código PHP:
<?php
$agent = $_SERVER['HTTP_USER_AGENT'];
echo "User agent reported as: " . $agent . "\n";
if (eregi("BlackBerry", $agent)) {
echo '
<SCRIPT LANGUAGE="javascript">
location.href = "Login.php";
</SCRIPT>
';
}
else
{
echo '
<SCRIPT LANGUAGE="javascript">
location.href = "Login2.php";
</SCRIPT>
';
}
?>