Dear Sunday Globe，

    I am writing to tell you about your article Smartphones Make Life Easier in last Sunday's newspaper．You did an excellent job explaining the good points of smartphones，but you didn't talk about their bad points at all．So，I hope you'll let me give your readers some advice on smartphone etiquette （礼仪）．

    The first point I'd like toaddressis loudness．When you talk on your smartphone in public，please don't shout．In fact，the microphones in smartphones are very sensitive （灵敏的）．So，you can be heard even if you speak quietly．

    Another point is about personal space．I don't think it is polite to make calls in small spaces full of people．This makes others uncomfortable and forces them to listen to your personal business．What's worse，it stops many face﹣to﹣face conversations from ever beginning．

    Lastly，doing two things at the same time is dangerous．For example，making calls while driving is a bad habit．Pay attention to the road!Similarly，when staying with your friends，turn off your smartphone and enjoy their company．

Yours truly，

Amber Jala