entity->isAttributeChanged Problem

[codeboy]

Hi there,

I'm checking the phone. The same phone number can be once. I'm using before After method.
For example, when editing a Lead, I change the status, but it still behaves like the phone is being edited.
This error is coming if I click on the edit. No problem if I just click on Edit Status. Here is the sample line of code.

public function beforeSave(Entity $entity, array $options = array())
{        
    $entityType = $entity->getEntityType();
    $fieldName = 'phoneNumber';

    $phone = preg_replace("/[^0-9]/", "", $entity->get($fieldName));

    $entityList = array('Lead', 'Meeting', 'Contact', 'Call', 'Customer');

    if(in_array($entityType, $entityList)) {
        if (!$entity->isNew()) {
            if($entity->isAttributeChanged($fieldName)) {
                $this->checkPhoneNumber($phone, $entityType, $fieldName);                    
            }
        }else{
            if($phone) {
                $this->checkPhoneNumber($phone, $entityType, $fieldName);
            }
        }
    }
}