be on the phone

基本解释

If you’ve got a hands-free headset, you could even pretend to be on the phone while working.
如果你有一个头戴式耳机，当你工作时可用来假装你在打电话。
The reason why so many guys struggle with the first call, is simply because they don’t know what to do, they don’t know what to say, they don’t know what the structure should be on the phone.
有那麽多男人纠结于首次通话的原因仅仅在于，他们不知道该做什麽，不知道该说什麽，不知道通话时的条理性是怎样的。
When most would be going to bed – in whatever country we would find ourselves – Farrell would still be on the phone, still writing or planning where he should be, what untold story needed telling.
当我们大多数人即将入睡时——不管我们身处哪个国家——法雷尔可能还在打电话，还在写作或者计划他应该去哪里，以及哪些未曾诉说的故事需要大白于天下。

There is nothing that it's like on the inside to be a cell phone.
手机的体内,是没有感觉的。
耶鲁公开课 - 死亡课程节选

Unidentified Man (Actor): You can be whoever you want to be on the phone, you know what I'm saying?
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My guess is they would be on the phone with one of those evil lawyers in a heart-beat wanting a little justice.
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They also mentioned that the keyboard on the Hermione will not flip down like on the P910, but will be on the phone body itself ( true to leaked photos), and that the amount of memory on the Hermione will likely be "in the gigabyte range".
ENGADGET: Sony Ericsson confirms Hermione and Sakura (the followup to the S710) are on their way