How do I...:you have an error in your SQL syntax; check the manual that corresponds to your mariadb server version for the right syntax to use near '? '

<pre><?php
if (isset($_POST['ingresarsim'])) {
	$ingresarSim = trim($_POST['ingresarsim']);



	}
 
$conexv = mysqli_connect("localhost","root","") or die("problemas al conectar");

mysqli_select_db($conexv,"ventas") or die("problemas base de datos");

$reg = mysqli_prepare($conexv, "SELECT COUNT(*) FROM ventas WHERE id = ?");
mysqli_stmt_bind_param($reg, "i", $ingresarSim);
mysqli_stmt_execute($reg);

$conteoFilas = mysqli_stmt_get_result($reg);

if (!$reg) {
    print_r(mysqli_error($conexv));
} else {
    if ($conteoFilas->field_count > 0) {
        $eliminado = mysqli_query($conexv, "DELETE FROM sim WHERE id = ?")or die ("Problemas en consulta:". mysqli_error($conexv));
;
        mysqli_stmt_bind_param($eliminado, "i", $ingresarSim);
        mysqli_stmt_execute($eliminado);
        echo "Datos Eliminados";
    } else {
        echo "Datos no han sido Eliminados";
    }
}
?>

I have tried a lot of advice online but couldnt resolve this error.