No contract and no limits
You do not pay any contract or extra payments if you use the prepaid service. According to the motto "with no limits", HaloNet VoIP service does not set limits neither for the recharge amount, nor for the account expiry date.
The only thing you need to do to start calling, is to create an account and install a free softphone.
You can also get the VoIP equipment and make calls independently of your computer.