For making calls you need to download a softphone widget. You need to enter the number in an international format to make calls. QtTel operates in a very simple way it first calls you then it calls the destination number. Though it seems to be a good catch for making free VoIP calls, These free VoIP calls are only limited to a maximum of 5 countries only. Also another small demerit is that a calls is connected for only 5 minutes. But yes you can dial the number again and again.

Below is the list of 5 countries where you can make free VoIP calls.
Australia— (FIX only)
Canada— (FIX & GSM)
UK— (FIX only)
Holland— (FIX only)
USA— (FIX & GSM).

Please give your feedback if you have been using QtTel Services.