Mobilephonebecomesaproblemforhighschools.Somehigh-schoolstudentsinAustraliaaren'tallowedtocarrymobilephonesduringschoolhours.Mobilephoneusedamongchildrenhasbecomeaproblemfortheschoolyears.SeveralchildrenhavegotmobilephonesasChristmaspresentsfromtheirparents,andmorestudentswillwantthem.MarryBrown,aheadmaster,saidthatmobilephonewasadistraction(分心事)tostudentsduringschoolhoursanditalsogaveteachersmuchtroubleintheirclassrooms.Teacherswerealsosayingthatsometimesstudentsmightusephonemessagestocheatduringexams.Shesaidsomeschoolshadtriedtoban(禁止)mobilephones.Someparentsfeltunhappybecausetheycouldn'tgetintouchwiththeirchildren.Manyteacherssaidstudentsshouldn'thavemobilephonesatschool.Buttherewasagoodreasonthattheycouldleavetheirphonesatschooloffices.Theyalsosaidtheywereeasilylostandwereadistractionforstudies.Manypeoplesaythattheyunderstandwhyparentswouldwanttheirchildrentohavephones,buttheythinkschoolsshouldletthestudentsknowwhentheycanusetheirmobilephones.26.SomehighschoolsinAustraliahavestoppedstudentsfromcarryingmobilephones______.