Bar all outgoing calls * 33 * Barring Code # SEND
to cancel the barring of outgoing calls # 33 * Barring Code # SEND

Bar all incoming calls * 35 * Barring Code # SEND
to cancel the barring of incoming calls # 35 * Barring Code # SEND

Bar all outgoing international calls * 331 * Barring Code # SEND
to cancel the barring of outgoing int'l calls # 331 * Barring Code # SEND

all of these codes are generic codes. it depends on your unit model and brand