Imagine if you had an ordinary cell phone, and any time you were in a wireless hotspot -- free calls anywhere in the world, never pay the cellular company a nickel.
想象一下你手里拿着一个普通的手机 不管什么时候只要你身处无线的热点 你就可以随意地打电话了，不管打到哪儿 都不用付一分钱的手机费