php chekbox return value (checked/not checked) and update

I ask for help as i have been stuck for days on a solution.

I have a form that submits a load of checkboxes - This works fine.

I then have a form i can open which will display said checkboxes and will be checked or not checked based on the sql query ran.

SQL query runs ok with echo but i cannot get the box to show as checked. After this i want to be able to check uncheck the boxes and update via an SQL.

<?php
    session_start();
    ini_set('display_errors', 1); error_reporting(-1);
    $data = $_GET['id'];
    require 'connect.php';
    $sql1 = "SELECT id, phone, email, pager
    FROM [dbo].[preference] WHERE id = '$data'";
    $stmt1 = sqlsrv_query($con,$sql1);
    if( $stmt === false) {
    die( print_r( sqlsrv_errors(),true));
}   
        while ($row1 = sqlsrv_fetch_array($stmt1)){
        $phone = $row1['id'];
        $phone = $row1['phone'];
        $email = $row1['email'];
        $pager = $row1['pager'];
}
?>


<td><input type="checkbox" name="phone" class="check" value="1">phone</td>
<td><input type="checkbox" name="email" class="check" value="1">email</td>
<td><input type="checkbox" name="pager" class="check" value="1">pager</td>

If anyone knows of any good links or videos where i can find an answer or knows how to do this i would be grateful. thanks.