If you noticed in your contacts list that free contacts do not show "Free" badge next to them there is a possibility that "Check Contacts" option is not turned ON. Please follow the steps to check it out:
1, Open Accounts tab in Voxofon application
2, Navigate to Contacts and tap on it
3, Observe whether "Check contacts" option is "ON or "OFF"
4, Turn it ON if you would like to see Free contacts in your contacts list and turn it OFF if you don't want to see the list of Free users.