WPMU

I use this plugin in the WPMU. All admins of blogs have to display only subscribes who I added in the main domain:

<?php
global $wpdb;
$wpdbtest_otherdb = new wpdb('xxx', 'xxx', 'xxx', 'xxx');
$row = $wpdbtest_otherdb->get_results("SELECT * FROM jU82We_sms_subscribes WHERE status = '1'");
foreach ($row as $username_active) :
 echo "<option>". $username_active->name."</option>";
endforeach;
?>

Problem: why sms not send?

How I have to edit code in wp-sms.php ?

if($sms->SendSMS()) {
$to = implode($wpdb->get_col("SELECT mobile FROM {$table_prefix}sms_subscribes"), ",");
echo "<div class='updated'><p>" . __('SMS was sent with success', 'wp-sms') . "</p></div>";
update_option('wp_last_credit', $sms->GetCredit());
}

https://www.ads-software.com/plugins/wp-sms/