<?php
    error_reporting(E_ALL);
    ini_set("display_errors", 1);
    session_start();

    if (isset($_SESSION['Mobile'])) {
        echo $_SESSION['Mobile']  . " Session <a href='logout.php'>logout</a>";
    }else if(isset($_COOKIE['Mobile'])){ //when user is logged with cookies
        echo $_COOKIE['Mobile']  . " cookie <a href='logout.php'>logout</a>";
    }else{ //when user is not loggedin
        header("Location: login.php");
        exit();
    }
?>
Welcome <?php echo $Mobile;?>