$to = '+380509185418@sms.umc.com.ua';
$subject = 'server';
$text = 'novoe sms';
$headers  = "From:xxx@mail.ru\r\n";
$headers .= 'MIME-Version: 1.0\r\n';
$headers .= 'Content-type: text/plain\r\n';
@mail($to, $subject, $text, $headers);

ошибок невыдает, но смс неотсылает

function send_message ($subj, $message, $email)
{
  $header= "From:wuhc@pub.ints.net\nX-Mailer: PHP Auto-Mailer\nContent-Type: text/plain;\n charset=koi8-r";
  $subj   =convert_cyr_string($subj,"w","k");
  $message=convert_cyr_string($message,"w","k");
  $header =convert_cyr_string($header ,"w","k");
   
mail("$email", "$subj", "$message", "$header");
}
//вызов функции
send_message ("user","moy sms iz inernet", "moy_email@domen.ua");

function send_message ($subj, $message, $email)
{
  $header= "From:wuhc@pub.ints.net\nX-Mailer: PHP Auto-Mailer\nContent-Type: text/plain;\n charset=koi8-r";
  $subj   =convert_cyr_string($subj,"w","k");
  $message=convert_cyr_string($message,"w","k");
  $header =convert_cyr_string($header ,"w","k");
   
mail("$email", "$subj", "$message", "$header");
}
//вызов функции
send_message ("12","moy sms iz inernet", "380509185418@sms.umc.com.ua");