$smsRu = new SmsRu('API-ID-TOKEN');

// with From
$result = $smsRu->setFrom('MYCOMPANY')
    ->send(new Sms('+79123456789', 'Some text'));
    
// without From
$result = $smsRu->send(new Sms('+79123456789', 'Some text'));

$smsBundle = [
    new Sms('+79123456789', 'Some text'),
    new Sms('+79123456790', 'Some message'),
    new Sms('+79123456791', 'Some notification')
];

// with From
$result = $smsRu->setFrom('MYCOMPANY')
    ->sendMulti($smsBundle);
    
// without From
$result = $smsRu->sendMulti($smsBundle);