code: def parse_masked_phone_number(html, parser=None):
      
      if parser is None:
          parser = bs4.BeautifulSoup(html, 'html.parser')
  
      fields = parser.find_all('span', {'class': 'field_prefix'})
      if not fields:
          raise VkParseError(
              'No <span class="field_prefix">...</span> in the \n%s' % html)
  
      result = []
      for f in fields:
          value = f.get_text().replace(six.u('\xa0'), '')
          result.append(value)
      return tuple(result)
docs: Get masked phone number from security check html
  
      :param html: str: raw html text
      :param parser: bs4.BeautifulSoup: html parser
      :return: tuple of phone prefix and suffix, for example: ('+1234', '89')
      :rtype : tuple