If anyone calls, ask for their number so I can call them back.

如有人打电话来，问问电话号码，这样我可以回电话。

《牛津词典》

If you are making a long distance call on a public telephone and run out of money, give the number on your phone to the person you're talking to. Then hang up the receiver and he can call you back.

如果你用公共电话打长途，钱花光了，把你的电话号码给你正在通话的人，然后挂上电话，他会给你回电话的。

youdao

Miss Rottenmeier followed her and tried to call her back, for she wanted to ask Deta a number of questions.

罗特麦耶小姐跟在她后面，想要叫她回来，因为她想问迪蒂几个问题。

youdao

There was no answer when authorities tried to call the number back.

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Other analysts are known to have published reports praising companies to the skies, and then tell fund managers who ring up for more information to call back on a private mobile number - so the analysts can tell the fund manager (on a phone line that is not being tape recorded) to ignore the report and avoid the stock like plague.

BBC: Analysts - the scourge of the City?

Include your cell phone number if you'd like a call back.

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