Internet service tends to be something that you must pay for in order to use. I believe the mentality is that, if you can afford a computer in order to need internet service, you can afford the...
Usually it means it's free to call another cell-phone, or mobile phone, yet it's usually within the companies service only. Ask about that when looking to buy a plan.
it could change dependant of what country but in most yes it is free but sometimes there are certain restrictions to what sites you may visit and things you can do