Syntax for displaying one variable in PHP of SQL query - php

Question

I was practicing making some sort of phonebook for my contacts and I ran into a problem when displaying the information in a table that is dynamically created using PHP. The table displays a row for each type of phone a person posses, for example for the house, cellphone and so on.
For that I made multiple functions that get information out of a database, but then I realized that I cannot think of a way to to return just the one variable I need (the number) because my select is also taking the id of the contact and of the type of phone to retrieve the number.
So my question is: How can I write in the PHP function that I only want to display the field for the phone number (numeroTelefono).
To further illustrate here is mySQL queries and PHP functions:
PHP function that creates the HTML and display the information the query gets:
function displaySpecificTels(){
if(isset($_POST['pIdC'])){
$idC = $_POST['pIdC'];
$casa = getSpecificCasa($idC);
$movil = getSpecificMovil($idC);
$trabajo = getSpecificTrabajo($idC);
$fax = getSpecificFax($idC);
$otro = getSpecificOtro($idC);
while($row = mysql_fetch_assoc($PLACEHOLDER)){
Perhaps remove the while and just echo? If so then what do I write where $row was?
echo
'<table class="tableFormat2 floatLeft">
<thead>
<tr>
<th>Casa</th>
<th>Móvil</th>
<th>Trabajo</th>
<th>Fax</th>
<th>Otro</th>
</tr>
</thead>
<tbody>
<tr>
<td>' . $row['casa'] . '</td>
<td>' . $row['movil'] . '</td>
<td>' . $row['trabajo'] . '</td>
<td>' . $row['fax'] . '</td>
<td>' . $row['otro'] . '</td>
</tr>
</tbody>
</table>';
}
}
}
SQL example of one of my functions:
function getSpecificCasa($idCont){
$id = 1;
$query = "SELECT bk.idTelefono , bk.idTipoTelefono, bk.numeroTelefono FROM telefono as bk WHERE bk.idTipoTelefono = $id AND bk.idTelefono = $idCont";
$result = do_query($query);
return $result;
}
EDIT:
Do_Query function does this:
function do_query($query){
global $db_server;
$result = mysql_query($query , $db_server);
if( !$result)
die("Falló la sentencia" . mysql_error());
return $result;
}
Would just returning bk.numeroTelefono and then using $result in the PHP that creates the HTML be viable?