•What is the differences between the Long distance call and Local call if use the Connection-VoIP?
Plenty of the VoIP providers offer the cheap or even free service for the users that make a call to the other subscriber. But your provider would also permit you to make a call and choosing the selected area code that is located in the different place from your original living. We can conclude that there is a different charge if you would like to have a long distance call compare to the local one. But there is also existed the other VoIP provider that charge you with the same cost (flat rate) in unlimited times.

•Who I can call if I already apply the VoIP service?
Depends on your chosen service, you are able to call anyone that have the existed telephone number including the long distance phone number, local telephone number, mobile phone Number, and International Number. Some VoIP provider also allows you to make calls with more than one person in the same time.