Cellphoneisverypopularandusedwidelyrecentyears.Withcellphone,peoplecan,anytime,contactfriends,talktofamiliesandsendblessingSMStothebelovedperson.However,exceptenjoyingsomanyconvineiences,cellphonealsohassomenegativeeffectsonus.Radiationgeneratedbycellphoneisharmfultohealthy;Specially,ringbellsmaydisturbothers.Forexample,ifyouaresleepingatnoonbreakintheoffice,asuddenringcallmayshockyoufromadream;whenallthestudentsarelisteningtotheteacher,aloudringbellwillinterrupttheclassandmakeothersannoyed;orduringameeting,acallnoicesisreallyimpolitetootherattendants.So,peopleshouldknowwhereandhowtousecellphoneproperly,andjustturnoffyourphoneifitmaybedisturbsothers.