old_contents: # -*- coding: utf-8 -*-
  
  from django.db import models
  from phonenumber_field.modelfields import PhoneNumberField
  
  
  class Caller(models.Model):
      """A caller is defined uniquely by their phone number.
  
      :param bool blacklisted: Designates whether the caller can use our
          services.
      :param char phone_number: Unique phone number in `E.164
          <http://en.wikipedia.org/wiki/E.164>`_ format.
      """
      blacklisted = models.BooleanField()
      phone_number = PhoneNumberField(unique=True)
  
      def __unicode__(self):
          return str(self.phone_number) + ' (blacklisted)' if self.blacklisted else ''
  
new_contents: # -*- coding: utf-8 -*-
  
  from django.db import models
  from phonenumber_field.modelfields import PhoneNumberField
  
  
  class Caller(models.Model):
      """A caller is defined uniquely by their phone number.
  
      :param bool blacklisted: Designates whether the caller can use our
          services.
      :param char phone_number: Unique phone number in `E.164
          <http://en.wikipedia.org/wiki/E.164>`_ format.
      """
      blacklisted = models.BooleanField()
      phone_number = PhoneNumberField(unique=True)
  
      def __unicode__(self):
          name = str(self.phone_number)
          if self.blacklisted:
              name += ' (blacklisted)'
          return name
  
subject: Fix an error in __unicode__