He lets his friend make a phone call to him in advance, finding an excuse to leave.

他事先让他的朋友打电话给他 借故离开

Where can I make a phone call?

在哪儿可以打电话？

I need to make a phone call.

我需要打个电话。

I have to make a phone call.

我得打个电话。

Wait there for a minute. I have to make a phone call.

在那儿等会儿，我得打个电话。

Then make a phone call or send an email.

然后拨打电话或发电子邮件。