Don't be direct
不要太直接。
We can say "May I speak to Mr.Bob?" "Could you hold on a minute please?"
尽量多用could would may，比如说，我可以找Bob接下电话吗？你能稍等一下吗？
Could you please repeat that ?
可以重复一下吗？
Could you speak up a little please?
可以大声一点吗？

I'm sorry. Can you please slow down? My English is not strong.
不好意思，可以说慢一点吗？我英语不好。
When you're on the phone, it's important to know if you should use formal or informal English.
打电话的时候，要注意正式用语和非正式用语的使用场合。
So you'll feel less nervous if you smile.
你微笑的时候，就不会那么紧张了。