Script to convert custom labels (with brazilian phone operators) to default labels on Google Contact, using Google Script. It can be necessary when you have a mobile or app that dont show numbers with this custom labels.

contact-labels.js

/**
 * you nedd enable some access, and create a spreedsheat called 'contact-data', before it
 * the script need to be run on google script - https://script.google.com
 */
function contactLabelChange()
{
  backupContacts();

  var contacts = getMyContacts();

  Logger.log('Starting label chages...');

  for (i = 0; i < contacts.length; i++ ) {

    var name     = contacts[i].getGivenName() + ' ' + contacts[i].getFamilyName();
    var fullname = contacts[i].getFullName();
    var mail     = contacts[i].getPrimaryEmail();
    var phones   = contacts[i].getPhones();

    for (var j in phones) {
      changeLabel(phones[j]);
    }

  }

  Logger.log('Label changes done.');
}

function backupContacts()
{
  var files       = DocsList.find('contact-data');
  var spreadsheet = SpreadsheetApp.open(files[0]);
  var sheet       = spreadsheet.insertSheet(Utilities.formatDate(new Date(), 'GMT-3', 'yyyy-MM-dd HH:mm'));

  spreadsheet.setActiveSheet(sheet);

  var contacts = getMyContacts();

  Logger.log('Running backup');

  for (i = 0; i < contacts.length; i++ ) {

    var name     = contacts[i].getGivenName() + ' ' + contacts[i].getFamilyName();
    var fullname = contacts[i].getFullName();
    var mail     = contacts[i].getPrimaryEmail();
    var phones   = contacts[i].getPhones();

    for (var j in phones) {
      sheet.appendRow([name, fullname, mail, phones[j].getLabel(), phones[j].getPhoneNumber()]);
    }
  }

  return true;
}

function getMyContacts()
{
  var group    = ContactsApp.getContactGroup('System Group: My Contacts');
  var contacts = ContactsApp.getContactsByGroup(group);
  Logger.log('Find %s contacts', contacts.length);
  return contacts;
}

function changeLabel(phone)
{
  changeLabelToMobile(phone);
  changeLabelToMain(phone);
}

function changeLabelToMobile(phone)
{
  if ( phone.getLabel() == 'Oi'
    || phone.getLabel() == 'Oi Móvel'
    || phone.getLabel() == 'Vivo'
    || phone.getLabel() == 'Tim'
    || phone.getLabel() == 'TIM'
    || phone.getLabel() == 'Mobile (TIM)'
    || phone.getLabel() == 'Claro'
    || phone.getLabel() == 'NEXTEL - SPO'
  ) {
    phone.setLabel(ContactsApp.Field.MOBILE_PHONE);
  }
}

function changeLabelToMain(phone)
{
  if ( phone.getLabel() == 'Oi Fixo'
    || phone.getLabel() == 'Embratel'
    || phone.getLabel() == 'Tim Fixo'
    || phone.getLabel() == 'Vivo Fixo'
    || phone.getLabel() == 'SOS PF'
  ) {
    phone.setLabel(ContactsApp.Field.MAIN_PHONE);
  }
}

function contactGroups()
{
  groups = ContactsApp.getContactGroups();
  for (i in groups)
  {
    Logger.log(groups[i].getName());
  }
}