Whilst you can still use Contacts_BackEXT an unsigned application, results would not however be compatible with PC Suite or Nokis Suite which would remove any such labels upon restoring data.
Symbian specialist until 31/01/2013 with interests in Maemo & MeeGo but an aversion to Windows!
Is it possible to edit the headings in contacts as was possible in previous s60 versions
exampl: change heading "mobile" to "dan"
It's not possible to natively edit Labels in your contacts list on Belle as it was in S60 devices.