There are many wardialing programs that will automatically scan through exchanges like a hot knife through butter. But, I prefer to do all my scanning by hand. This gives you more freedom to interact with anything you may find. Sometimes wardialing may overlook something that you could have originally found by hand. Sometimes when you call something you have to press #, *, #08, or some kind of crazy combination to access a "hidden menu". In short I will conclude by saying that I would suggest hand scanning. But, it's all personal choice.