新手请问高人：Voipdiscount 120 天 freedays 意义到底何在？

vd 网站的解释不甚明了。根据网站的介绍：“Buying credits entitles you to 120 Freedays (unless stated otherwise). This means you can call all countries in the free* destinations list for 120 days at no costs. When the 120 days are over, you will keep your credit, and the normal rate will be charged for these destinations.”可是voipdiscount的free destination list上并没有中国，打中国是1美分/m。既然如此，对我们来说，Voipdiscount 120 天 freedays 意义到底何在?

小弟实在驽钝，请前辈赐教！