Most of us have had the experience of being offered great incentives to sign on with a phone company. Some are very attractive but they limit your usage to the specific phone number and its location. If it s a home phone then you get the deal calling from there. PLUS your call requires NO loose change. A. Cost control is the most obvious.
Time control is the second.
Every calling destination has its own per minute fee. This per minute fee determines for how long a person can call for. Tying up the phone for hours can be very annoying. The time limit also gives you cost limits. If you re sister is calling your aunt in the Philippines with your regular phone, she can talk for hours, with NO limit.