deactivate (a mobile phone)
to be connected to someone on the phone
PUT (A CALL) THROUGH
HANG UP
put the receiver down
SPEAK UP
connect one caller to another
GET THROUGH
PICK UP
talk louder
SWITCH OFF / TURN OFF
return someone’s call
answer a call, lift the receiver to take a call
stop talking on the phone
GET OFF (THE PHONE)
CALL BACK / GET BACK TO (SOMEONE)
HOLD ON / HANG ON
wait