A —multimedia message service J —fixed dialB —subscriber identity module K —automatic redialC —voice prompt L —two-way charging schemeD —high fidelity M—call divertE —flip answer N —power offF —slide phone O —out of serviceG —warning tone P —outgoing callH —roaming service Q —contactI —standby modeExamples：(N)关机(P)呼出通话