One possible version:

With the rapid development of IT and information industry, there has been a dramatic rise in the cell phones, which are now essential to millions of people. But everything has two sides.

On one hand, cell phones contribute a lot to our daily life. Firstly, cell phones enable people to easily and quickly communicate with one another whenever and wherever you are. Secondly, it is the multifunction of cell phones that helps us survive those boring moments.

On the other hand, the disadvantages can never be denied. The most important disadvantage is the unknown effects on health in case of over-use. Furthermore, if people become too reliant on the use of cell phones，our face –to-face skills may decline.

From my perspective, any new invention has its drawbacks, but such negative aspects cannot always diminish its popularity. I strongly suggest that we use cell phones moderately and appropriately to make them more beneficial.

题目分析：本文是篇材料作文，在写作之前认真审题，首先要注意内容要求，写一篇关于手机使用的文章，阐释手机给人们生活带来的利与弊（各两点），提出你自己对手机使用的看法,并给出合理的建议。词数100-120。由此可知是议论文体，要用一般现在时。要点有三1.手机的优点；2. 手机的缺点；3.个人观点和建议。注意层次划分和句子的衔接，以提高作文的档次。字数也要注意。

【亮点说明】文中使用了非常好的高级词汇和短语为文章增色不少，比如essential，contribute a lot to，whenever and wherever you are，decline，drawbacks等等。同时还运用了 强调句式; which引导的非限制性定语从句等等。并注意了文章的层次和句子的衔接如：On one hand ，On the other hand，Furthermore, but等等。