Hello, who’s speaking?

你好，谁在说话？

This is he/she.

我是**。

Please hold on/hang on.

请等一等。

Sorry he is not here, can I take a message?

他现在不在，我能捎个信吗？

Sorry. I think you dialled the wrong number.

抱歉，我想你拨错号码了。

Sorry, wrong number.

抱歉，打错了。

Excuse me. I am a foreigner. Would you slow down a little bit?

请原谅，我是一个外国人。你可以把语速放慢一些吗？

I’m sorry. I didn’t catch you. Could you repeat that again?

抱歉，我刚刚没听懂你说的，你可以重复一遍吗？

Sorry，Come again?

抱歉，能不能再说一遍？