29-03-2015 10:00 PM
29-03-2015 10:39 PM - edited 29-03-2015 10:40 PM
What sort of landline are you trying to call (e.g. the area code or prefix)?
What does your online account say about your landline minutes balance and cash credit balance?
Do you have an active/current membership? You need one to be able to use any services.
Hope this helps.