You should say:

　　When it happened

　　Where it happened

　　Who you were with

　　Why you felt happy by using your cellphone

　　1.适用人群：全适用

　　2.主题：用手机寻找笔友

　　3.故事线：我很高兴用我的手机来检查我的邮箱，和一个陌生人分享我的快乐和烦恼。通过手机与陌生人取得联系，我感到很有魔力。

　　When it comes to the experience, the most impressive memory in my mind was happening in last summer.

　　During the holiday, I stayed at home alone and I was so addicted into playing mobile phone, which sometimes can make me bored to death. One day, suddenly, I wanted to find a foreign pen pal on the Internet. It was a coincidence that it's the first time I knew the website called PenPal World. Then I used my phone to register an account by instinct. After that, I uploaded some personal information and my email address. Finishing, I started to browse others' home page in order to find more fascinating and excellent pals.

　　I was attracted by a Belarus boy's introduction and his smile looks like an angel, and I saw that he can speak fluent English, Russian and German. I was so amazed by that he also had gift in playing musical instruments.So I pressed the button and sent an email to him and asked him some questions about how to acquire more skills in a short time. It was so amazing that he replied me an hour later and he was so nice to answer all of my questions in a gentle way. I was touched by his behavior, I mean, I was a totally stranger to him. So it's just organically happening that we became pen pals.

　　From that moment on, I was so delighted to use my mobile phone to check my mail box. It was quite a pleasure for me to share my happiness and troubles with a stranger. I felt so magical to get in touch with a stranger through my mobile phone.

　　4.口语高分语料

　　地道用词：gift in

　　get in touch with

　　register an account by instinct

　　高分句型：During the holiday, I stayed at home alone and I was so addicted into playing mobile phone, which sometimes can make me bored to death.

　　It was a coincidence that it's the first time I knew the website called PenPal World.

　　So I pressed the button and sent an email to him and asked him some questions about how to acquire more skills in a short time.

　　It was so amazing that he replied me an hour later and he was so nice to answer all of my questions in a gentle way.