The cheapest is a station-to-station call, then a person-to-person call.

最便宜的是叫号电话，然后是叫人电话。

youdao

Hello, operator. I'd like to make a person-to-person call to San Francisco.

你好，接线员，我想往旧金山打个私人电话。

youdao

A person-to-person call can only be accepted by the particular person you are calling.

叫人电话只能是你叫的那个人接听。

youdao

Video on-demand has to do with the delivery what they call content, while the video phone is the deliver of person-to-person communication. These are not nearly the same, but they both involve video.

随需视频必须与传送他们所称的“内容“相关,而视频电话是一种,个人对个人的传送，那不是,大致相同的，但它们都包含视频。

麻省理工公开课 - 媒体、教育、市场课程节选

You know, I'm going to -- on the last question I think I -- hold on a second, I think I want to call on -- I want to call on a young person.

WHITEHOUSE: Town Hall in Los Angeles

In the ruling, Judge Pauley dismissed that claim, likening the Facebook access instead to a phone wiretap in which one person on the call allows the government to monitor it -- a practice that has been ruled constitutional.

ENGADGET: Judge rules Facebook users can share friends' profiles with the feds

The phone even displays a button during calls, called informally "the escape hatch, " which allows you to kill the Wi-Fi call and force the phone to redial the other person over Sprint for no added charge.

WSJ: Personal Technology: A $19 Unlimited Phone Plan