I know this. I've said it a few times, but by you smiling, maybe laughing a little bit, tell yourself a joke in your head before you go to answer or to call somebody in English, you will portray yourself as being happy and interesting on the phone.
我知道我已經說過好幾次了,但是當你微笑著,也許笑一點,在你用英語接聽或打電話給某人之前,在腦子裡給自己講一個笑話,你就會把自己描繪成打電話時感到快樂和有趣。