To ask friend about homework maybe?
to contact teacher (?)
.... oh ya,,,boleh juga untuk bukak it dan cari maklumat...
to call ambulance @ police @ 999 when soomething happened such as robbery, kidnapping, accident and many more....
1.student can call police or ambulance if required
2.students can contact their parents or guardian in an emergency
3.mobile phones are a useful time-keeping for the students who do not have watch