Mascara Javascript para os novos telefones de São Paulo

phonemask.js

// using: https://github.com/igorescobar/jQuery-Mask-Plugin

var phone_fields, phone_mask;

phone_fields = $(".phone", scope);

phone_mask = /^(\(?11\)? ?9(5[0-9]|6[0-9]|7[01234569]|8[0-9]|9[0-9])[0-9]{1})/g;

phone_fields.each(function() {
  var mask, phone_field;
  phone_field = $(this);
  mask = phone_field.val().match(phone_mask) ? '(00) 00000-0000' : '(00) 0000-0000';
  return phone_field.mask(mask, {
    onKeyPress: function(phone, e, currentField, options) {
      if (phone.match(phone_mask)) {
        return $(currentField).mask('(00) 00000-0000', options);
      } else {
        return $(currentField).mask('(00) 0000-0000', options);
      }
    }
  });
});

Ótima mascara.
Que tal implementar o teste aos demais DDDs? http://www.anatel.gov.br/Portal/exibirPortalNivelDois.do?codItemCanal=1794&nomeVisao=Cidad%E3o&nomeCanal=Telefonia%20M%F3vel&nomeItemCanal=Nono%20D%EDgito

https://gist.github.com/musaray